Qico is an FidoNet Technology Network (FTN) compatible mailer.
It can work via TCP/IP as well as on modem links.
Look at sample configs for more information.

Features:

  * Support for EMSI, ZModem, ZedZap, Hydra
  * Support for BinkP
  * Support for 4D Binkley-style, Amiga-style outbound, fileboxes
  * Daemon mode for outgoing calls
  * Substs with support for hidden-lines
  * Support for session time limit
  * Support for minimum connect speed limit

and so on.