In article <1169219208.711032.48480@51g2000cwl.googlegroups.c om>
linusx@gmail.com writes:
>
> I am running ESMTP Sendmail 8.12.11/8.12.11 and keep getting a lot of
>bounced back emails from other domains that I am not sending emails to.
>I have found out that my server is being used as a relay but I can not
>find any information on how to disable relaying except for my local
>domains. I was told by upgrading my sendmail version that this would be
>disabled by default, but it didn't work. Can someone please tell me
>what configuration settings I need to change in my mc or cf files?

Sendmail has disabled relaying by default since version 8.9.0 IIRC.
There are ways to enable it, selectively or completely - most users need
the selectively part, almost no-one needs the completely part, and that
one requires active intent to enable. Hence trying to find out how to
disable relaying in sendmail isn't going to get you very far. Anyway
nothing in your .mc file indicates that you have accidentally enabled
the completely part - in fact it's mostly comments, no need to post the
lines that start with 'dnl'.

Most likely your server isn't actually being used as a relay at all, and
the bounces are due to spammers faking sender addresses in your domain,
without the messages actually passing through your box. But there are
some cases where e.g. web services on your box can trick sendmail into
not relaying, but sending out mail that is locally-generated from
sendmail's perspective.

For any actual diagnosis, we need to see the log lines (both 'from=' and
'to=') for messages that you think have been relayed by sendmail.

--Per Hedeland
per@hedeland.org