Jason R. Mastaler wrote:
> "Jesse D. Guardiani" <[EMAIL PROTECTED]> writes:
>
>> I think I'm going to go ahead and implement a reverse SMTP probe
>> from a Perl script at the MTA level. If it works well, I'll write a
>> qmail SMTP patch in C to do the same thing.
>
> Cool. You might check on the qmail list (and patch page) if anyone
> has already done this. I wouldn't be surprised, as this is something
> that is part of both Exim and Postfix, so is obviously a "hot"
> feature.
I'm not so sure about it being "hot", Jason. I searched a little this
weekend on Google and I couldn't find ANYTHING for Postfix, Exim, QMail,
or any other MTA.
What keywords are you searching for? I've been looking for things like
"SMTP probe", "reverse SMTP lookup", etc...
Also, I checked the qmail website. Nothing. Doesn't look like anyone has
made a patch for this yet. Not even qpsmtpd (perl SMTP daemon for qmail)
has it, and qpsmtpd is focused solely on spam prevention!
Furthermore, on Friday or Thursday I switched my boss's "-spambounce"
alias to point to one of my email accounts. Check this out:
He received 119 spam bounces over the weekend. Each is unique and
fatal.
But here's the really interesting part: Only ONE was from a remote host.
118 spam bounces came from cvsup.wingnet.net: our qmail server.
This basically means that if I did indeed want to drop bounces for
pending emails - I could. I have complete control over my own server,
so I can make sure that ONLY fatal bounces cause a pending email to be
dropped. Autoresponders will never come from MAILER-DAEMON at my local
qmail server.
At this point, I'm just wondering which would be easier to implement:
1.) TMDA pending email auto dropping from local qmail server fatal bounce
2.) qmail reverse SMTP "RCPT TO:" probe for envelope sender and/or FROM
header on remote host.
And also, since I'm having such trouble finding any information on
previous attempts to implement a reverse SMTP probe, I'm wondering if
there is good reason NOT to do such a thing (In which case a TMDA
solution would be required).
I guess I just need to bite the bullet and go fish on the qmail mailing
lists and try to dredge up some useful opinions on the matter.
--
Jesse Guardiani, Systems Administrator
WingNET Internet Services,
P.O. Box 2605 // Cleveland, TN 37320-2605
423-559-LINK (v) 423-559-5145 (f)
http://www.wingnet.net
We are actively looking for companies that do a lot of long
distance faxing and want to cut their long distance bill by
up to 50%. Contact [EMAIL PROTECTED] for more info.
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