My server is getting a lot of spam that appears to be claiming it's from my domain while it's from elsewhere:
Received: from my.ip.addr.ess (124-12-9-193.static.tfn.net.tw [124.12.9.193]) by mydomain.com (Postfix) with SMTP id 56BEC6010B for <war...@sinamail.com>; Thu, 17 Sep 2009 02:55:54 -0600 (MDT) Received: from iedfmwp.yahoo.com (iedfmwp.yahoo.com [179.232.190.108]) by with Microsoft SMTPSVC(5.0.2195.6824); Sat, 13 Apr 2002 10:35:17 -0100 How can I block these? I've been reading, searching, and configuring quite a bit, but can't figure out how to block these so they're not accepted (for relaying?). Here's what I have in Postfix's config: smtpd_client_restrictions = reject_unknown_client_hostname, reject_unauth_pipelining, reject_rbl_client zen.spamhaus.org, reject_unknown_reverse_client_hostname smtpd_recipient_restrictions = permit_sasl_authenticated, reject_unauth_destination I also tried changing mynetworks to 127.0.0.1 but that hasn't helped with this. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com