F=p
Process return path per RFC821 Deprecated
The SMTP MAIL From:
command normally uses the envelope address for the
sender:
MAIL From:<jqp@wash.dc.gov>
If the F=p
delivery
agent flag is specified,
sendmail instead sends a
transformed version of that address. The
transformation can take one of two forms, depending
on the first character of the envelope address. If
that address begins with an @
character, an @
, the local host name,
and a comma are prefixed to that address to create a
legal return path:
<@hub:jqp@wash.dc.gov>
↓
becomes
↓
<@ourhost,@hub:jqp@wash.dc.gov>
If the envelope address for the sender does not start
with an @
character, an @
,
the local host name, and a colon are prefixed to
that address:
<jqp@wash.dc.gov> becomes <@ourhost:jqp@wash.dc.gov
See also the DontPruneRoutes
option (DontPruneRoutes on page 1024).
Note that these forms of address transformations are
discouraged by RFC1123. For this reason, the
F=p
delivery
agent flag is deprecated and might be removed from
future versions of
sendmail.
Get sendmail, 4th Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.