author | Pawel Solyga <Pawel.Solyga@gmail.com> |
Sun, 15 Feb 2009 18:55:05 +0000 | |
changeset 1352 | 4f118840617f |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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""" |
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Tools for sending email. |
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""" |
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|
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import mimetypes |
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import os |
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import smtplib |
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import socket |
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import time |
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import random |
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from email import Charset, Encoders |
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from email.MIMEText import MIMEText |
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from email.MIMEMultipart import MIMEMultipart |
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from email.MIMEBase import MIMEBase |
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from email.Header import Header |
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from email.Utils import formatdate, parseaddr, formataddr |
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|
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from django.conf import settings |
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from django.utils.encoding import smart_str, force_unicode |
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|
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# Don't BASE64-encode UTF-8 messages so that we avoid unwanted attention from |
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# some spam filters. |
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Charset.add_charset('utf-8', Charset.SHORTEST, Charset.QP, 'utf-8') |
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|
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# Default MIME type to use on attachments (if it is not explicitly given |
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# and cannot be guessed). |
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DEFAULT_ATTACHMENT_MIME_TYPE = 'application/octet-stream' |
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|
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# Cache the hostname, but do it lazily: socket.getfqdn() can take a couple of |
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# seconds, which slows down the restart of the server. |
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class CachedDnsName(object): |
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def __str__(self): |
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return self.get_fqdn() |
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def get_fqdn(self): |
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if not hasattr(self, '_fqdn'): |
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self._fqdn = socket.getfqdn() |
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return self._fqdn |
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|
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DNS_NAME = CachedDnsName() |
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|
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# Copied from Python standard library, with the following modifications: |
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# * Used cached hostname for performance. |
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# * Added try/except to support lack of getpid() in Jython (#5496). |
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def make_msgid(idstring=None): |
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"""Returns a string suitable for RFC 2822 compliant Message-ID, e.g: |
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|
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<20020201195627.33539.96671@nightshade.la.mastaler.com> |
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|
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Optional idstring if given is a string used to strengthen the |
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uniqueness of the message id. |
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""" |
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timeval = time.time() |
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utcdate = time.strftime('%Y%m%d%H%M%S', time.gmtime(timeval)) |
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try: |
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pid = os.getpid() |
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except AttributeError: |
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# No getpid() in Jython, for example. |
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pid = 1 |
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randint = random.randrange(100000) |
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if idstring is None: |
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idstring = '' |
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else: |
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idstring = '.' + idstring |
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idhost = DNS_NAME |
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msgid = '<%s.%s.%s%s@%s>' % (utcdate, pid, randint, idstring, idhost) |
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return msgid |
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|
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class BadHeaderError(ValueError): |
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pass |
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|
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def forbid_multi_line_headers(name, val): |
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"""Forbids multi-line headers, to prevent header injection.""" |
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val = force_unicode(val) |
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if '\n' in val or '\r' in val: |
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raise BadHeaderError("Header values can't contain newlines (got %r for header %r)" % (val, name)) |
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try: |
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val = val.encode('ascii') |
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except UnicodeEncodeError: |
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if name.lower() in ('to', 'from', 'cc'): |
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result = [] |
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for item in val.split(', '): |
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nm, addr = parseaddr(item) |
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nm = str(Header(nm, settings.DEFAULT_CHARSET)) |
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result.append(formataddr((nm, str(addr)))) |
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val = ', '.join(result) |
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else: |
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val = Header(val, settings.DEFAULT_CHARSET) |
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else: |
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if name.lower() == 'subject': |
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val = Header(val) |
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return name, val |
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|
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class SafeMIMEText(MIMEText): |
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def __setitem__(self, name, val): |
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name, val = forbid_multi_line_headers(name, val) |
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MIMEText.__setitem__(self, name, val) |
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|
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class SafeMIMEMultipart(MIMEMultipart): |
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def __setitem__(self, name, val): |
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name, val = forbid_multi_line_headers(name, val) |
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MIMEMultipart.__setitem__(self, name, val) |
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|
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class SMTPConnection(object): |
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""" |
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A wrapper that manages the SMTP network connection. |
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""" |
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|
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def __init__(self, host=None, port=None, username=None, password=None, |
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use_tls=None, fail_silently=False): |
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self.host = host or settings.EMAIL_HOST |
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self.port = port or settings.EMAIL_PORT |
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self.username = username or settings.EMAIL_HOST_USER |
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114 |
self.password = password or settings.EMAIL_HOST_PASSWORD |
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115 |
self.use_tls = (use_tls is not None) and use_tls or settings.EMAIL_USE_TLS |
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116 |
self.fail_silently = fail_silently |
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117 |
self.connection = None |
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118 |
|
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119 |
def open(self): |
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120 |
""" |
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121 |
Ensures we have a connection to the email server. Returns whether or |
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122 |
not a new connection was required (True or False). |
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123 |
""" |
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124 |
if self.connection: |
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125 |
# Nothing to do if the connection is already open. |
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126 |
return False |
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127 |
try: |
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128 |
# If local_hostname is not specified, socket.getfqdn() gets used. |
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129 |
# For performance, we use the cached FQDN for local_hostname. |
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130 |
self.connection = smtplib.SMTP(self.host, self.port, |
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131 |
local_hostname=DNS_NAME.get_fqdn()) |
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132 |
if self.use_tls: |
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133 |
self.connection.ehlo() |
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134 |
self.connection.starttls() |
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135 |
self.connection.ehlo() |
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136 |
if self.username and self.password: |
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137 |
self.connection.login(self.username, self.password) |
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138 |
return True |
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139 |
except: |
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140 |
if not self.fail_silently: |
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141 |
raise |
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142 |
|
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143 |
def close(self): |
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144 |
"""Closes the connection to the email server.""" |
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145 |
try: |
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146 |
try: |
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147 |
self.connection.quit() |
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148 |
except socket.sslerror: |
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149 |
# This happens when calling quit() on a TLS connection |
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150 |
# sometimes. |
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151 |
self.connection.close() |
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152 |
except: |
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153 |
if self.fail_silently: |
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154 |
return |
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155 |
raise |
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156 |
finally: |
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157 |
self.connection = None |
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158 |
|
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159 |
def send_messages(self, email_messages): |
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160 |
""" |
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161 |
Sends one or more EmailMessage objects and returns the number of email |
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162 |
messages sent. |
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163 |
""" |
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164 |
if not email_messages: |
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165 |
return |
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166 |
new_conn_created = self.open() |
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167 |
if not self.connection: |
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168 |
# We failed silently on open(). Trying to send would be pointless. |
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169 |
return |
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170 |
num_sent = 0 |
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171 |
for message in email_messages: |
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172 |
sent = self._send(message) |
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173 |
if sent: |
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174 |
num_sent += 1 |
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175 |
if new_conn_created: |
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176 |
self.close() |
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177 |
return num_sent |
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178 |
|
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179 |
def _send(self, email_message): |
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180 |
"""A helper method that does the actual sending.""" |
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181 |
if not email_message.recipients(): |
54
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182 |
return False |
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183 |
try: |
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184 |
self.connection.sendmail(email_message.from_email, |
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185 |
email_message.recipients(), |
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|
186 |
email_message.message().as_string()) |
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187 |
except: |
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|
188 |
if not self.fail_silently: |
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|
189 |
raise |
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|
190 |
return False |
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|
191 |
return True |
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192 |
|
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193 |
class EmailMessage(object): |
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194 |
""" |
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195 |
A container for email information. |
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196 |
""" |
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197 |
content_subtype = 'plain' |
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198 |
multipart_subtype = 'mixed' |
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199 |
encoding = None # None => use settings default |
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200 |
|
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201 |
def __init__(self, subject='', body='', from_email=None, to=None, bcc=None, |
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202 |
connection=None, attachments=None, headers=None): |
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|
203 |
""" |
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|
204 |
Initialize a single email message (which can be sent to multiple |
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|
205 |
recipients). |
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|
206 |
|
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207 |
All strings used to create the message can be unicode strings (or UTF-8 |
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|
208 |
bytestrings). The SafeMIMEText class will handle any necessary encoding |
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|
209 |
conversions. |
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|
210 |
""" |
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|
211 |
if to: |
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|
212 |
assert not isinstance(to, basestring), '"to" argument must be a list or tuple' |
54
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213 |
self.to = list(to) |
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214 |
else: |
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|
215 |
self.to = [] |
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|
216 |
if bcc: |
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|
217 |
assert not isinstance(bcc, basestring), '"bcc" argument must be a list or tuple' |
54
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218 |
self.bcc = list(bcc) |
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|
219 |
else: |
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220 |
self.bcc = [] |
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221 |
self.from_email = from_email or settings.DEFAULT_FROM_EMAIL |
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222 |
self.subject = subject |
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223 |
self.body = body |
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|
224 |
self.attachments = attachments or [] |
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|
225 |
self.extra_headers = headers or {} |
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226 |
self.connection = connection |
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227 |
|
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228 |
def get_connection(self, fail_silently=False): |
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229 |
if not self.connection: |
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230 |
self.connection = SMTPConnection(fail_silently=fail_silently) |
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231 |
return self.connection |
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232 |
|
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def message(self): |
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encoding = self.encoding or settings.DEFAULT_CHARSET |
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msg = SafeMIMEText(smart_str(self.body, settings.DEFAULT_CHARSET), |
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self.content_subtype, encoding) |
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if self.attachments: |
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body_msg = msg |
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msg = SafeMIMEMultipart(_subtype=self.multipart_subtype) |
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if self.body: |
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msg.attach(body_msg) |
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for attachment in self.attachments: |
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if isinstance(attachment, MIMEBase): |
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msg.attach(attachment) |
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else: |
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msg.attach(self._create_attachment(*attachment)) |
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msg['Subject'] = self.subject |
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msg['From'] = self.from_email |
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msg['To'] = ', '.join(self.to) |
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# Email header names are case-insensitive (RFC 2045), so we have to |
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# accommodate that when doing comparisons. |
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header_names = [key.lower() for key in self.extra_headers] |
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if 'date' not in header_names: |
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msg['Date'] = formatdate() |
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if 'message-id' not in header_names: |
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msg['Message-ID'] = make_msgid() |
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for name, value in self.extra_headers.items(): |
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msg[name] = value |
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return msg |
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|
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def recipients(self): |
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""" |
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Returns a list of all recipients of the email (includes direct |
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addressees as well as Bcc entries). |
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""" |
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return self.to + self.bcc |
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268 |
|
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def send(self, fail_silently=False): |
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"""Sends the email message.""" |
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return self.get_connection(fail_silently).send_messages([self]) |
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|
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def attach(self, filename=None, content=None, mimetype=None): |
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""" |
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Attaches a file with the given filename and content. The filename can |
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be omitted (useful for multipart/alternative messages) and the mimetype |
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is guessed, if not provided. |
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278 |
|
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If the first parameter is a MIMEBase subclass it is inserted directly |
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into the resulting message attachments. |
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""" |
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if isinstance(filename, MIMEBase): |
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assert content == mimetype == None |
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self.attachments.append(filename) |
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285 |
else: |
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assert content is not None |
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self.attachments.append((filename, content, mimetype)) |
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288 |
|
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def attach_file(self, path, mimetype=None): |
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"""Attaches a file from the filesystem.""" |
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filename = os.path.basename(path) |
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content = open(path, 'rb').read() |
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self.attach(filename, content, mimetype) |
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294 |
|
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def _create_attachment(self, filename, content, mimetype=None): |
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""" |
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Converts the filename, content, mimetype triple into a MIME attachment |
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object. |
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""" |
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if mimetype is None: |
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mimetype, _ = mimetypes.guess_type(filename) |
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if mimetype is None: |
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mimetype = DEFAULT_ATTACHMENT_MIME_TYPE |
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basetype, subtype = mimetype.split('/', 1) |
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if basetype == 'text': |
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attachment = SafeMIMEText(smart_str(content, |
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settings.DEFAULT_CHARSET), subtype, settings.DEFAULT_CHARSET) |
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308 |
else: |
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# Encode non-text attachments with base64. |
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attachment = MIMEBase(basetype, subtype) |
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attachment.set_payload(content) |
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Encoders.encode_base64(attachment) |
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if filename: |
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attachment.add_header('Content-Disposition', 'attachment', |
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filename=filename) |
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return attachment |
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|
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class EmailMultiAlternatives(EmailMessage): |
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""" |
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A version of EmailMessage that makes it easy to send multipart/alternative |
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messages. For example, including text and HTML versions of the text is |
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made easier. |
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323 |
""" |
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multipart_subtype = 'alternative' |
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325 |
|
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def attach_alternative(self, content, mimetype=None): |
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"""Attach an alternative content representation.""" |
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self.attach(content=content, mimetype=mimetype) |
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329 |
|
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330 |
def send_mail(subject, message, from_email, recipient_list, |
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fail_silently=False, auth_user=None, auth_password=None): |
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332 |
""" |
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Easy wrapper for sending a single message to a recipient list. All members |
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of the recipient list will see the other recipients in the 'To' field. |
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335 |
|
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If auth_user is None, the EMAIL_HOST_USER setting is used. |
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If auth_password is None, the EMAIL_HOST_PASSWORD setting is used. |
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338 |
|
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Note: The API for this method is frozen. New code wanting to extend the |
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functionality should use the EmailMessage class directly. |
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341 |
""" |
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342 |
connection = SMTPConnection(username=auth_user, password=auth_password, |
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fail_silently=fail_silently) |
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return EmailMessage(subject, message, from_email, recipient_list, |
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connection=connection).send() |
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346 |
|
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def send_mass_mail(datatuple, fail_silently=False, auth_user=None, |
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auth_password=None): |
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""" |
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Given a datatuple of (subject, message, from_email, recipient_list), sends |
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each message to each recipient list. Returns the number of e-mails sent. |
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|
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If from_email is None, the DEFAULT_FROM_EMAIL setting is used. |
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If auth_user and auth_password are set, they're used to log in. |
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If auth_user is None, the EMAIL_HOST_USER setting is used. |
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If auth_password is None, the EMAIL_HOST_PASSWORD setting is used. |
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|
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Note: The API for this method is frozen. New code wanting to extend the |
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functionality should use the EmailMessage class directly. |
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""" |
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connection = SMTPConnection(username=auth_user, password=auth_password, |
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fail_silently=fail_silently) |
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messages = [EmailMessage(subject, message, sender, recipient) |
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for subject, message, sender, recipient in datatuple] |
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return connection.send_messages(messages) |
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|
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def mail_admins(subject, message, fail_silently=False): |
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"""Sends a message to the admins, as defined by the ADMINS setting.""" |
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EmailMessage(settings.EMAIL_SUBJECT_PREFIX + subject, message, |
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settings.SERVER_EMAIL, [a[1] for a in settings.ADMINS] |
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).send(fail_silently=fail_silently) |
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|
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def mail_managers(subject, message, fail_silently=False): |
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"""Sends a message to the managers, as defined by the MANAGERS setting.""" |
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EmailMessage(settings.EMAIL_SUBJECT_PREFIX + subject, message, |
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settings.SERVER_EMAIL, [a[1] for a in settings.MANAGERS] |
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).send(fail_silently=fail_silently) |