Date: Sun, 15 Aug 2010 22:15:57 +0200 From: Erik Norgaard <norgaard@locolomo.org> To: freebsd-questions@freebsd.org Subject: Re: Open Mail Relay Message-ID: <4C684AFD.5030607@locolomo.org> In-Reply-To: <20100815152031.D72621065675@hub.freebsd.org> References: <201008142113.o7ELDsin018314@mail.r-bonomi.com> <20100815152031.D72621065675@hub.freebsd.org>
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On 15/08/10 13.57, peter@vfemail.net wrote: > Assume, as Mr. Bonomi suggests, that some bad guy has installed some type of additional mailer on the machine or another machine that's allowed to relay mail. How would I go about locating that other mailer? If the messages are indeed relayed through your server then you can see it in the logs and in the Received header field which host is sending the mail to your server. If somebody forges mail to appear to come from your domain, but not relayed through your server there is really not much you can do. Only the recipient server can reject the mails. Some servers support spf and you can help other servers know that mail from your domain must originate from your server by adding a txt entry in your dns. BR, Erik
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