Spam sent to me from my own mail server ?
cswiger at mac.com
Wed Aug 27 17:37:42 UTC 2008
On Aug 27, 2008, at 7:38 AM, Peter Ulrich Kruppa wrote:
> for some time now I keep receiving spam mails from my own (small)
> mail server, some of them with faked usernames some of them even
> with my own (ulrich at ...).
> 1) How is this possible?
Forging email headers is trivial. You can do it with telnet by hand,
although spammers tend to use malware which blasts lots of messages....
> 2) What can I or do I have to do against it?
> I am running a quite plain sendmail setup from 7.0 -STABLE.
Configuring anti-spam measures is something that would occupy a book.
For starters, look into greylisting, RBLs, and anti-spam tools which
hook into the milter interface. There's also some config-level
changes documented here:
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