Postfix is totally fsck'd...

[David C. Hart]

Go to the Postfix list and post the results from "Postconf -n"

I can assure you that an open relay is caused by a misconfiguration in
contrast to a bug in PF.

On Sat, 2004-01-31 at 11:16, Lorenzo Prince wrote:
> I am guessing this has taken place over the last couple of days.  I first saw
> that I was getting fewer messages than usual.  This was not a problem, because I
> just thought that fewer people were sending messages.  Well, the problem got
> worse.  I now stopped receiving messages through fetchmail which I know should
> come every day without fail.  Then it started taking a long time to receive my
> cron messages.  I didn't receive a message yesterday that I should have gotten in
> the afternoon, and naturally, I thought it was the server that sent it, (maybe
> something to do with this latest virus slowing down the server.  So I started
> sending test messages through the local server.  I sent about 5 tests and lost
> all of them.  I then checked the maillog
> 
> grep postfix /var/log/maillog |less
> 
> and according to the log, someone has found my postfix and is trying to use it as
> a relay to try to send hundreds or possibly thousands of messages to what looks
> like an alphabetical list of AOL users.  The problem is that Postfix seems to
> actually be relaying these messages and then picking up the bounces from AOL and
> relaying them back to the sender who has an empty from address.  I don't
> understand, however, how or why this is happening, as I have postfix configured
> to only accept local relays, and the log is saying the messages are coming from a
> remote sender.  When I do the relay test at mail-abuse.org, it tells me that my
> system appears to reject relay attempts.  I ended up having to switch my MTA to
> Sendmail, because Postfix is so backed up to the point that my system takes
> almost 5 minutes to boot, and messages delivered from local users to local users
> aren't even getting through anymore.  What can I do to solve the Postfix problem?
> What can I do to stop this relaying even though Postfix is configured not to
> relay from remote connections at all?  I started using postfix when I heard that
> sendmail had a history of insecurity.  Is this better now?  Should I just start
> using sendmail instead of Postfix?
> 
> Thanks for any help
> PRINCE
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