Thanks, that really helps!
Reading up on courierperlfilter, it says that each message may have more
than one control file. When would that be the case? If multiple control
files, what would one have that the other doesn't?
Ricardo
----- Original Message -----
From: "Gordon Messmer" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Saturday, March 18, 2006 9:55 AM
Subject: Re: [courier-users] verify envelope sender?
Ricardo Kleemann wrote:
I'm somewhat confused as to how exactly this works and should work. I
have
an /etc/courier/maildroprc which runs some checks and may return an
error.
For example, I have this:
if ($RECIPIENT =~ /321.net$/)
{
STAT=`/usr/local/bin/check_config $RECIPIENT`
if ($STAT =~ /^Error:/)
{
echo "550 $STAT"
EXITCODE=77
exit
}
}
Don't do that in maildroprc. Once you've accepted mail (via smtp), it's
your responsibility to make sure that it's delivered. By accepting the
mail, you're promising the sender that you'll handle all further
processing.
If you have a set of conditions under which you will refuse to process
mail, the best place to process them is in a global mail filter (see the
man page for courierfilter). In addition to the example filters included
with Courier, there are frameworks available in Perl and Python (I wrote
the one Python framework). If you refuse a message via a global mail
filter, the message won't be accepted by Courier's SMTPd, and the sending
MTA will generate its own DSN for the sender. You won't get any from your
own system.
Additionally each user has a .mailfilter file which may also output an
error
(for example if a virus is found). In all cases, I'm asserting
EXITCODE=77,
and print out an error message.
Do that in a global filter, too. There are a couple of ways to get clamav
hooked up to a global mail filter. There's a dedicated daemon written in
C, and a filter in the pythonfilter package.
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