Stop sendmail from bouncing mail to invalid off-site aliases

Greetings,

All of our servers are running Sendmail 8.13.1 on CentOS 4.

On most of our servers, we keep up with the validity of off-site
aliases rather aggressively. However, we have a few customers renting
dedicated servers from us who do not.

The other day, SpamCop filed a complaint to our upstream provider due
to misdirected bounces.

These bounces are occurring when spam is sent using a forged, and
valid, email address to an alias on our server that points to an off-
site account that is no longer valid.

How could we go about forcing sendmail to keep these bounces to
itself, by sending them to postmaster or some other method?

Suggestions appreciated!

Also, are there any recommended books for sendmail administration? Is
the bat worth a read?

Thanks!

Re: Stop sendmail from bouncing mail to invalid off-site aliases

Post removed (X-No-Archive: yes)

Re: Stop sendmail from bouncing mail to invalid off-site aliases [mailing list aliases]

centyx@centyx.net writes:
> All of our servers are running Sendmail 8.13.1 on CentOS 4.
>
> On most of our servers, we keep up with the validity of off-site
> aliases rather aggressively. However, we have a few customers renting
> dedicated servers from us who do not.
>
> The other day, SpamCop filed a complaint to our upstream provider due
> to misdirected bounces.
>
> These bounces are occurring when spam is sent using a forged, and
> valid, email address to an alias on our server that points to an off-
> site account that is no longer valid.
>
> How could we go about forcing sendmail to keep these bounces to
> itself, by sending them to postmaster or some other method?
>
> Suggestions appreciated!

Define (mailing list like) "helper aliases".

For list "sample":
sample-owner: sample-request
sample-request: real-email-of-person-receiving-the-bounces

"sample-owner" defines who gets bounces for messages sent to "sample.
"sample-request" alias is used to avoid "giving away" real address when
sample-owner is expanded to fill "envelope sender"

> Also, are there any recommended books for sendmail administration?
> Is the bat worth a read?

It is the best book about sendmail but it is *thick* (1000+ pages).
So decision to study it "eats" a lot of time to fulfill.
Do not expect to achieve "full understanding" in single pass :-)

--
[pl>en: Andrew] Andrzej Adam Filip : anfi@priv.onet.pl : anfi@xl.wp.pl
Open-Sendmail: http://open-sendmail.sourceforge.net/
"Give me enough medals, and I'll win any war."
-- Napoleon
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