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<header>Allow untrusted routing</header> <center><tt>allow_untrusted_routing</tt></center> <hr> This parameter controls if Postfix will forward mail with sender-specified routing (user[@%!]remote[@%!]site) from untrusted clients to destinations that are blessed by the <a href=opt_relay_domains><tt>relay_domains</tt></a> parameter. <p> By default, untrusted clients are not allowed to specify routing. This closes a nasty open relay loophole where a backup MX host can be tricked into forwarding junk mail to a primary MX host which then spams it out to the world. <hr>