Package milter-regex

Milter plug-in for regular expression filtering

http://www.benzedrine.cx/milter-regex.html

Milter-regex is a milter based filter that makes it possible to filter
emails using regular expressions.

System Administration (Section 8)
milter-regex
The milter-regex plugin can be used with the milter API of sendmail(8) to filter mails using regular expressions matching SMTP envelope parameters and mail...