smtp2mta

Listen for SMTP traffic and send it to an MTA script.

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.