From the transflt.mer file:
[quote user="transflt.mer"]
# Action is one or more characters indicating the action MercuryS should
# take when the expression is matched: the first character in the action
# can be one of the following:
#
# 'R' to refuse the transaction and block all subsequent commands
# 'F' to fail the current command only (allow further attempts)
# 'D' to drop the connection immediately with no error response
# 'B' to issue an error response then drop the connection immediately.
# 'L' to log a system message
# 'X' to stop this phase of transaction filtering for this message
# 'S' to suppress all transaction filtering stages for this message.
#
# The difference between 'R' and 'F' is that 'R' will cause all subsequent
# delivery commands in the session to be refused, while 'F' will only fail
# the current command - other commands may still be permitted.
#
# The 'D' and 'B' commands essentially do the same thing, but the 'B'
# command does it more politely. Use 'B' if there's any possibility that
# the connected machine is actually legitimate, because it gives at least
# some level of feedback to the sender or administrator.
#
# To understand the difference between 'X' and 'S', you need to be aware
# that transaction filtering is done in several "passes", each pass testing
# a different state of the SMTP transaction. The 'X' action only exits from
# the current pass, meaning that future passes will still take place. The
# 'S' action, however, exits from the current pass and suppresses all
# further transaction filtering on the message altogether.
#
[/quote]
<p>From the transflt.mer file:</p><p>[quote user="transflt.mer"]</p><p># Action is one or more characters indicating the action MercuryS should
# take when the expression is matched: the first character in the action
# can be one of the following:
#
#&nbsp;&nbsp;&nbsp; 'R' to refuse the transaction and block all subsequent commands
#&nbsp;&nbsp;&nbsp; 'F' to fail the current command only (allow further attempts)
#&nbsp;&nbsp;&nbsp; 'D' to drop the connection immediately with no error response
#&nbsp;&nbsp;&nbsp; 'B' to issue an error response then drop the connection immediately.
#&nbsp;&nbsp;&nbsp; 'L' to log a system message
#&nbsp;&nbsp;&nbsp; 'X' to stop this phase of transaction filtering for this message
#&nbsp;&nbsp;&nbsp; 'S' to suppress all transaction filtering stages for this message.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
#
# The difference between 'R' and 'F' is that 'R' will cause all subsequent
# delivery commands in the session to be refused, while 'F' will only fail
# the current command - other commands may still be permitted.
#
# The 'D' and 'B' commands essentially do the same thing, but the 'B'
# command does it more politely. Use 'B' if there's any possibility that
# the connected machine is actually legitimate, because it gives at least
# some level of feedback to the sender or administrator.
#
# <b>To understand the difference between 'X' and 'S</b>', you need to be aware
# that transaction filtering is done in several "passes", each pass testing
# a different state of the SMTP transaction. The 'X' action only exits from
# the current pass, meaning that future passes will still take place. The
# 'S' action, however, exits from the current pass and suppresses all
# further transaction filtering on the message altogether.
#
[/quote]</p><p>&nbsp;</p>