It is immediately followed
(withno intervening spaces) by the envelope-sender address, a literal <@>, and the
envelope-recipient address (where the envelope-recipient address has already undergone
aliasing and processing by a user??™s ~/.forward file). Neither address should be
surrounded with angle braces. The address pair is followed by whitespace (spaces
and tabs) and then a keyword. There are three possible keywords:
DISCARD
Mail from this sender to this recipient is accepted, and then discarded and
logged. DISCARD can be followed by a colon. It can also be followed by
optional text that will be logged as the reason for the discard.
TEMP:
Mail from this sender to this recipient is rejected with a temporary error (causing
the message to be deferred for a later delivery attempt). This keyword must
be followed by a valid 4xy SMTP code and text that describes the reason for the
temporary failure.
ERROR:
Mail from this sender to this recipient is rejected with a permanent error (causing
the message to bounce). This keyword must be followed by a valid 5xy
SMTP code and text that describes the reason for the rejection.
To illustrate, consider the following example of such entries in an access database:
Compat:bin@your.site<@>admin@your.site DISCARD
Compat:ads@spam.site<@>taka@your.site DISCARD
Compat:db@your.site<@>lp@your.
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