sendmail milter plugin for recipient checking
The milter-checkrcpt plugin can be used with the milter API of
sendmail(8) to filter mails with invalid recipients.  The validity of a
recipient address is determined by querying another mail server over
SMTP.

Maintainer: Okan Demirmen <okan@openbsd.org>

WWW: http://www.benzedrine.cx/milter-checkrcpt.html
