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