ArGoSoft Mail Server .NET Freeware is a mail server for local domains and users.
If you want to deliver mail outside of your server, to the Internet, allow relay option must be activated. If this option is enabled, you must specify DNS server, which will be used by your server to retrieve mail exchangers for destination domains.
If Relay is enabled, it is recommended to also enable SMTP authentication to protect your server from unauthorized users. If SMTP authentication is not enabled, then anyone who finds your server will be able to spam the World.