<header>Sender dependent transport mappings</header>
The optional sender dependent addresses file allows the relay host for
for outgoing SMTP connections to be set on a per-address or per-domain basis. The left
hand side of each entry can be either a full email address like
<tt>foo@bar.com</tt>, or just a domain like <tt>@bar.com</tt>. <p>
The right hand side must be in the format <i>transport:nexthop</i>. In the
typical case where you want to relay mail via a specific mail server,
<i>transport</i> should be <tt>smtp</tt> and <i>nexthop</i> the hostname or
IP address of the mail server. <p>
<hr>
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