Date: Wed, 27 Aug 2008 10:37:11 -0700 From: Chuck Swiger <cswiger@mac.com> To: Peter Ulrich Kruppa <ulrich@pukruppa.net> Cc: FreeBSD-Questions <freebsd-questions@freebsd.org> Subject: Re: Spam sent to me from my own mail server ? Message-ID: <D44319AE-EBDB-477C-AFF6-3C7F218960EF@mac.com> In-Reply-To: <48B566EA.2000406@pukruppa.net> References: <48B566EA.2000406@pukruppa.net>
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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@...). > 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: http://www.sendmail.org/m4/anti_spam.html Regards, -- -Chuck
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