smtp2mta (hackage): This is a simple SMTP server that forwards all mail to a sendmail-compatible script.  The primary intended use is to allow broken MUAs that expect to always send over SMTP to send with a standard MTA script.  (This allows one to authenticate with a mailserver using SSH keys, for example.)  smtp2mta can be run as a standalone server, or can serve connections from behind inetd.
Keywords: network|program