PostCast Server is an SMTP mail server program that completely replaces your ISP's SMTP server. By making one small change in your e-mail program, you can start sending messages directly from your computer.
edition of PostCast Server has these additional features that are not
available in the free version:
Support for SMTP gateways
Multiple mail folders
Firewall and proxy support
Automatic detection of DNS addresses
50 parallel threads for sending
Client-server communication logs
The entry-level SMTP server software. Focuses on
direct-delivery of your e-mail messages to your recipient's mailbox and
includes a number of useful features.