F=@
User can be User Database key V8.7 and later
When V8.7 or above sendmail has
been compiled with User Database support (userdb on page 942) you can
specify this delivery agent flag for a delivery
agent and thereby cause that delivery agent to
perform a User Database lookup for each address it
handles. For sender header and envelope addresses, a
User Database mailname keyword is used to perform
reverse aliasing. For recipient envelope addresses,
a User Database maildrop keyword is used to perform
additional forward aliasing.[290] Note that any address with a leading
@ character (in
the $: part of
the triple returned by the parse rule set 0) causes User Database
lookups to be skipped. Also note that the absence of
an F=i delivery
agent flag (F=i on page
772) suppresses User Database rewriting of the
envelope sender.
If the F=@ delivery
agent flag is present, the delivery agent will try
to use the User Database. If the F=@ delivery agent flag
is absent, all User Database lookups are skipped. In
general, this delivery agent flag should be present
for the local and
local-clone delivery agents but absent for all
others. In configuration files prior to version 6
(The V Configuration Command on
page 580), this delivery agent flag is automatically
set for the local
delivery agent.
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