Date: Wed, 03 Jan 2007 21:24:37 -0500 From: Sahil Tandon <sahil@tandon.net> To: FreeBSD-questions <questions@freebsd.org> Subject: Re: Is there a solution for 550 User Unknown mails Message-ID: <459C6565.9020409@tandon.net> In-Reply-To: <d5eb95fc0701031555q1146a593tbb1c9a7de08b2626@mail.gmail.com> References: <d5eb95fc0701031555q1146a593tbb1c9a7de08b2626@mail.gmail.com>
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Derrick Ryalls wrote: > This is perhaps off topic, but all machines in question are running > FreeBSD :) This problem is related to the configuration of your MTA, not FreeBSD. > Every day I get dozens of failed email notifications in the form of: > > UNDELIVERABLE MAIL Your message to the following recipients cannot be > delivered: <wtcxqomfaq@alicedsl.de>: webmail.hansenet.de > [213.191.73.2]: > > RCPT TO:<wtcxqomfaq@alicedsl.de> > > <<< 550 RCPT TO:<wtcxqomfaq@alicedsl.de> User unknown [...] > With secondary mail servers, I am accepting mail for other domains, > and then forwarding them on. It is my belief that acting as a > secondary mail server is what is causing me to receive all these > errors. [...] > Assuming that my guessing is correct, is there any way to stop this > flood of reject emails short of not being a secondary server for > anyone? Which MTA? In Postfix, you can use the relay_recipient_maps parameter to query a list of valid recipients. The MX for which you're acting as secondary should be able to provide the list. -- Sahil Tandon <sahil@tandon.net>
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