[Tutor] Mailing Made Simple - Multiple Recipient Problem

Karl Pflästerer sigurd at 12move.de
Tue Jan 6 14:36:34 EST 2004

On  6 Jan 2004, Sean Steeg <- steegness at hotmail.com wrote:

> OK then, just to make sure I grasp what's going on here then:

> Where is the SMTP server getting its recipient information from?  That
> is to say, which is parsed to send the letter out to someone?
> smtplib's send function calls for recipients in its argument, outside
> of any headers in the letter itself; I would think it'd be there where
> the recipients are found.

,----[ Python library docu ]
| `sendmail(from_addr, to_addrs, msg[, mail_options, rcpt_options])'
|      Send mail.  The required arguments are an RFC 822 from-address
|      string, a list of RFC 822 to-address strings, and a message string.

So the to_addrs are a list of strings.  To send e-mail to multiple
recipients you could write:

In [1]: import smtplib

In [2]: server = smtplib.SMTP('')

In [3]: msg = """
   ...: mFrom: me
   ...: mTo: some people 
   ...: m
   ...: mbody body body
   ...: m"""

In [4]: server.sendmail('me', ['admin', 'testeins'], msg)
Out[4]: {}

If I look in the log file of my smtp server I see (logfile is debug
level and all possible checking turned off):

ceb} < 220 SMTP-Server Classic Hamster Version 2.0 (Build on wintendo.pflaesterer.de is ready.
ceb} > ehlo []
ceb} < 250-wintendo.pflaesterer.de
ceb} < 250-8BITMIME
ceb} < 250 HELP
ceb} > mail FROM:<me>
ceb} < 250 OK
ceb} > rcpt TO:<admin>
ceb} < 250 OK
ceb} > rcpt TO:<testeins>
ceb} < 250 OK
ceb} > data
ceb} < 354 Start mail input; end with <CRLF>.<CRLF>
ceb} Mailrouter: Mail from <me> delivered to all recipients
ceb} < 250 OK

So for every entry in the list of recipients one RCPT TO is created.

> Let's say I want to switch this around to get multiple recipients.  I
> know I can adjust the headers easily enough, so that the multiples are
> CCs instead of TOs, but what should I do with that first argument for
> the smtplib.send() function?

Hope the above helps (I think you mean smtplib.sendmail()).

(please consider to stop top posting; it's hard to read).

Please do *not* send copies of replies to me.
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