We (NIP - in the form of Chris Withers, Stephen Harrison, and Simon
Coles) have put some thought into the question of how to get emails
into Zope, and have come up with a design which we thought we'd pass
by the list before we start doing something.
The problem we are trying to solve is basically being to email
"[EMAIL PROTECTED]" and that email ends up in the Zope ZODB
processed in whatever way is appropriate.
We aren't worried about sending email, that's done well at the
moment. We also wanted to keep things as simple and quick as possible
:-) This means trying to avoid getting involved with mail systems as
much as we can.
Most MTAs can be setup to pass an email to the stdin of a program.
Sendmail will do this, and Exim (http://www.exim.org/) will also pay
attention to what that program returns and queue the message for
re-try later if it fails. So using Exim, we don't have to get into
any messy stuff about queuing mails if the Zope server is down.
Some alternatives we considered and didn't go for:
- write something in Zope to listen for SMTP connections, effectively
large portions of an MTA. This would be cool but painful.
- pull mail from a POP or IMAP server. This had the downside that it
introduced polling into the system (slow) and also required something
to happen on a schedule, which doesn't happen in Zope yet.
- Within Exim, use the "pipe" transport to get email for a particular
host sent to a program on the standard input. If the program called
returns certain codes then Exim will queue the message and try again.
- This program takes the email message and puts it into Zope, probably
by calling a DTML Method or something. This would probably be
configured by objects in the Zope ZODB which say effectively "When
you get email for this address, then call this Method".
- The DTML Method is responsible for doing the right things to get
the email message into the ZODB in whatever form is appropriate.
We haven't yet figured out how to make sure the above mail handling
program can find all the relevant configuration documents. Is there
some way of efficiently finding all instances of a particular ZClass?
(Chris W. still isn't sure that's how the configuration will work but
that's the plan for the moment, so any thoughts would be appreciated)
What we'll do is a first version that hard codes everything in the
above script and prove the principle of the thing, and then move onto
Does this sound like what people need? Any thoughts, comments, warnings?
I don't know yet what kind of schedule we'll be able to do this on
but drop me a mail and when there's something to play with we'll let
--------- My opinions are my own, NIP's opinions are theirs ----------
Simon J. Coles Email: [EMAIL PROTECTED]
New Information Paradigms Work Phone: +44 1344 753703
http://www.nipltd.com/ Work Fax: +44 1344 753742
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