[Buildbot] #3196: external sendmail command for mail notifier

[Buildbot trac]

#3196: external sendmail command for mail notifier
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Reporter:  mmonkk       |      Owner:
    Type:  enhancement  |     Status:  new
Priority:  major        |  Milestone:  undecided
 Version:  0.8.10       |   Keywords:  sendmail, notifier
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 MailNotifier works via twisted-mail for now, which sometimes leads to
 trouble.
 One problem is absence of mail queue in twisted. Restarting buildbot
 process leads to all queued mail lost.
 Another problem is TLS/SSL support, which may be very different for all
 SMTP servers out there. For example, STARTTLS is required by twisted to
 work over SSL, but many servers offer separate port, awaiting for pure SSL
 connection to it. Some servers may block authenticated connections over 25
 port, so twisted will fail sending email, while reqular mail user agent,
 such as Outlook will work.

 This problems can be addressed by supporting mail delivery via system
 '/usr/bin/sendmail' command which is a well-known way to send email in
 unix world.
 Mail transfer agents like postfix and exim provide compatible
 /usr/bin/sendmail replacement, allowing local mail be sent with no
 authorization and delivered based on configuration, maintaining message
 queues, mail routing and so on.
 There are some programs like msmtp or ssmtp, able to talk to any smtp
 server, supporting TLS and authorization of all kinds.

 It would be nice to have ability for buildbot's MailNotifier work with
 local sendmail command, as it's simple to implement and leads to great
 flexibility. This also let's to avoid installing additional python ssl
 modules (which can be triky on older enterprise systems).
 This also makes error reporting better, as twisted-mail with no ssl claims
 that server not supporting TLS, which is very confusing for peaple not
 familiar with pyhon and twisted.

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Ticket URL: <http://trac.buildbot.net/ticket/3196>
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