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.


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