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FILTER-PAUSE(8)		  BSD System Manager's Manual	       FILTER-PAUSE(8)

NAME
     filter-pause -- smtpd filter to pause on new connections

SYNOPSIS
     filter-pause [-dv]	[-s seconds]

DESCRIPTION
     filter-pause is a filter for smtpd(8) which can be	used to	pause on new
     connections before	emitting the standard initial SMTP greeting.  This is
     useful to avoid the so called "slamming" technique	used by	some senders
     of	spam mails.

     The options are as	follows:

     -d		 Debug mode, if	this option is specified, filter-pause will
		 run in	the foreground and log to stderr.

     -s	seconds	 Set the number	of seconds to pause before sending the initial
		 greeting.  The	accepted values	are within the range of	1s and
		 300s.

		 The default seconds value is 5s.

     -v		 Produce more verbose output.

     filter-pause runs by default in a chroot.

     The debug and verbose options given with the smtpd(8) invocation are in-
     tially passed to filter-pause.

     With filter-pause enabled,	smtpd(8) simply	waits the specified amount of
     seconds on	each new connection.  If the remote server starts sending SMTP
     commands before the greeting, the connection is rejected.	Otherwise, the
     connection	is accepted and	normally processed.

SEE ALSO
     filter_api(3), smtpd.conf(5), smtpd(8)

STANDARDS
     J.	Klensin, Simple	Mail Transfer Protocol,	RFC 5321, October 2008.

HISTORY
     The first version of filter-pause was written in 2015.

AUTHORS
     Joerg Jung	<jung@openbsd.org>

BSD				 May 16, 2016				   BSD

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | STANDARDS | HISTORY | AUTHORS

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