MAIL
Working with other mail systems in your organization
Domino interoperates with other mail servers and systems through its support of Internet standards and message transfer agents (MTAs) for X.400, cc:Mail, and other systems. Domino can exchange mail with other SMTP servers and route mail to and from X.400 and cc:Mail systems through the X.400 and cc:Mail MTAs. Additional third-party tools are available to provide interoperability with and gateways to other mail systems.

If you have some users who use Lotus cc:Mail, you need at least one server running the cc:Mail message transfer agent (MTA) to connect your Domino system to the cc:Mail system.

If you have some users who use an X.400 mail system, you need at least one Release 4 server running the X.400 MTA to connect your Domino system to the X.400 system.

If you have users in the local Internet domain who are not listed in the Domino Directory, set up a smart host so the Router can forward messages for users in other local mail systems.