23.7 Alphabetized Database-Map Types | 945
page 772) is present in the delivery agent that is selected for the sender. Also note that
the recipient headers are not rewritten by UDB unless the F=j flag (?§20.8.31 on page
773) is set for the delivery agent that was selected for the recipient.
Naturally, the maildrop and mailname keywords should occur in pairs. Each outgoing
address that is created with mailname should have a corresponding maildrop entry so that
return mail can be delivered. In the previous example, a reasonable pair might look like
this:
bob:mailname Bob.Roberts@Here.US.EDU
Bob.Roberts:maildrop bob
Here, outgoing mail from the user named bob will be addressed as though it is from
Bob.Roberts@Here.US.EDU. Incoming mail (whether it is original or in reply to the outgoing
mail) will be addressed as though it is to the name Bob.Roberts, which will be transformed
into and delivered to the local user bob.
23.7.27.3 A :default outgoing hostname
The mailname keyword allows the host part of outgoing addresses to mask the real hostname
of the originating machine. This property can, for example, be used to convert the
hostname into a firewall name:
bob:mailname bob@Firewall.US.EDU
Here, the canonical name of bob??™s machine is Here.US.EDU. Th emailname keyword causes
outgoing mail from bob to appear as though it is from the firewall machine
(Firewall.
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