How to - Configure qmail server to avoid backscatter.

[armindo.costa]

Hello.

What is the best solution to avoid backscatter (stop doing)?

Server with: qmail + vpopmail.


Thanks,
A.Costa


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[Kyle Wheeler-2]

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On Friday, October 30 at 12:55 PM, quoth armindo.costa@...:
>What is the best solution to avoid backscatter (stop doing)?

It depends on your setup. There are several options out there, and
which one is best depends on your system. For example, there's the
realrcptto patch, but that doesn't work well with some forms of
virtual domains (such as vpopmail). There are several options that
create a list of valid recipients and check against that list, which
works well if your set of valid recipients can be determined ahead of
time and if that set doesn't change too often. There's also the
RCPTCHECK and CHECKENV patches, both of which let you write your own
script for verifying addresses. And there are other options as well.

Which one is "best" depends on you.

~Kyle
- --
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[John Levine]

>What is the best solution to avoid backscatter (stop doing)?

If you're willing to do some relatively complex software installation,
Bruce Guenter's mailfront package can do a range of checks at SMTP
time and reject rather than bounce most undeliverable mail.  You also
have to install his CVM package which provides a daemon that mailfront
can use validate addresses handled by qmail or vmailmgr.

The documention is sparse but adequate, and it's very well written.  I
use mailfront to do invalid address rejection along with some other
built-in rules, and have added modules to do DCC checks and call
spamassasin's spamd at SMTP time.

http://untroubled.org/software.php

[Joerg Backschues-2]

armindo.costa@... wrote:

> What is the best solution to avoid backscatter (stop doing)?

What's about BATV
<http://en.wikipedia.org/wiki/Bounce_Address_Tag_Validation>?

The qmail all in one (aio) patch supports BATV
<http://www.backschues.net/qmail/>.

--
Greetings
Jörg Backschues