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<p> First, the <a href="postconf.5.html#address_verify_relayhost">address_verify_relayhost</a> parameter allows you to
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override the <a href="postconf.5.html#relayhost">relayhost</a> setting, and the <a href="postconf.5.html#address_verify_transport_maps">address_verify_transport_maps</a>
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<p> Second, each address class is given its own address verification
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version of the message delivery transport, as shown in the table