if name.lower() != 'bcc': # 4E: bcc gets mail, no hdr
msg[name] = ', '.join(value) # add commas between cc

recip = list(set(recip)) # 4E: remove duplicates
fullText = msg.as_string() # generate formatted msg

sendmail call raises except if all Tos failed,

or returns failed Tos dict for any that failed

self.trace('Sending to...' + str(recip))
self.trace(fullText[:self.tracesize]) # SMTP calls connect
server = smtplib.SMTP(self.smtpServerName) # this may fail too
self.getPassword() # if srvr requires
self.authenticateServer(server) # login in subclass
try:
failed = server.sendmail(From, recip, fullText) # except or dict
except:
server.close() # 4E: quit may hang!
raise # reraise except
else:
server.quit() # connect + send OK
self.saveSentMessage(fullText, saveMailSeparator) # 4E: do this first
if failed:
class SomeAddrsFailed(Exception): pass
raise SomeAddrsFailed('Failed addrs:%s\n' % failed)
self.trace('Send exit')

def addAttachments(self, mainmsg, bodytext, attaches,
bodytextEncoding, attachesEncodings):
"""
format a multipart message with attachments;
use Unicode encodings for text parts if passed;
"""

add main text/plain part

msg = MIMEText(bodytext, _charset=bodytextEncoding)
mainmsg.attach(msg)

add attachment parts

encodings = attachesEncodings or (['us-ascii'] * len(attaches))
for (filename, fileencode) in zip(attaches, encodings):

filename may be absolute or relative

if not os.path.isfile(filename): # skip dirs, etc.
continue

guess content type from file extension, ignore encoding

contype, encoding = mimetypes.guess_type(filename)
if contype is None or encoding is not None: # no guess, compressed?
contype = 'application/octet-stream' # use generic default
self.trace('Adding ' + contype)

build sub-Message of appropriate kind

maintype, subtype = contype.split('/', 1)
if maintype == 'text': # 4E: text needs encoding
if fix_text_required(fileencode): # requires str or bytes
data = open(filename, 'r', encoding=fileencode)

The mailtools Utility Package | 963