Hi all - I'm new to qmail and the list. I'm just getting it setup this
weekend to replace a very old homegrown mail system at my domain.
I've been browsing around the list archives and various qmail web pages,
looking at SMTPd patches people have written for filtering, and haven't quite
found what I've been looking for. Figured I'd ask before I embark on patching
qmail-smtpd myself.
Here is the basic logic of my current homegrown SMTPd:
<-- HELO whatever.com
--> (howdy back - remember address)
<-- MAIL FROM:<[EMAIL PROTECTED]>
--> (OK - remember address)
<-- RCPT TO:<[EMAIL PROTECTED]>
At this point, I do a bunch of checks:
Is the RCPT a valid person? If no, reject with 'user unknown'; else
Is the RCPT mailbox unfiltered? If yes, allow the message; else
Is the FROM address on the "nice list"? If yes, allow the message; else
Is the HELO domain on the banned list? If yes, reject the message; else
Is the FROM on the banned list? If yes, reject the message; else
[person wins! email goes through!]
So basically my SMTPd has a concept of "filtered" and "unfiltered" mailboxes,
but this is done on the SMTP end before the message data is ever received. I
know I can filter my head off with procmail or similar, but I don't even want
to waste the bandwidth on the crap in the first place.
I prefer to be a hard-nose and reject everything that matches something on my
filters, whereas a couple of people get mail at my domain that need to bypass
the filters (they actually get legitimate mail from people at hotmail! The
horrors!).
With all of this, I'd still like some smarter spam tools than what I have now,
such as verifying the HELO hostname and FROM envelope as valid domains (I
reject lots of mail based on bogus and ill-formed HELO hostnames which are
sure signs of spammers who don't know what they are doing, even though the
HELO hostname isn't terribly important rfc-wise last I checked)
So, anything like this exist without post-processing after the message has
already been received, or should I pull up my text editor and get cracking?
Thanks in advance for any suggestions. So far I'm loving qmail; I started
with a sendmail book, but decided I didn't need that kind of angst in my life
and downloaded qmail. I got it setup in less than an hour, and am just now
trying to work out these spam issues before I switch it on live.
: Bob Maple (Brazilian) : When love is gone, there's always justice. :
: bobm at burner dot com : And when justice is gone, there's always :
: : force. And when force is gone, there's :
: http: burner.com : always Mom. Hi, Mom! - Laurie Anderson :
