NAME

     filter-regex — smtpd filter for regular expression filtering

SYNOPSIS

     filter-regex [-l limit] [file]

DESCRIPTION

     filter-regex is a filter for smtpd(8) which can be used to filter mails using regular
     expressions matching SMTP session parameters.

     The options are as follows:

     -l limit  Set the number of lines limit of filter-regex after which the regular expression
               processing is stopped and the mail is accepted.  The accepted values are within
               the range of 1 and UINT_MAX.

               The default limit value is 0 (unlimited).

     Depending if one of the regular expressions matches mails are either accepted or rejected
     with a SMTP 554 reply.  Non-matching mails are always accepted.

FILES

     /etc/mail/filter-regex.conf  Default filter-regex configuration file.

SEE ALSO

     filter-regex.conf(5), filter_api(3), smtpd.conf(5), smtpd(8), re_format(7), regex(3)

HISTORY

     The first version of filter-regex was written in 2015.

AUTHORS

     filter-regex was intially written by Armin Wolfermann <armin@wolfermann.org> and further
     improved by
     Joerg Jung <jung@openbsd.org>.