Understanding How Mail Routing Works in Domino

Through Release 4 (R4), the working of Domino mail routing was pretty straightforward. You used Domino's mail router to route mail between Notes users. The mail router used what Lotus calls NRPC or Notes RPC (Notes Remote Procedure Call) to transfer mail between servers. You used a Lotus Message Transfer Agent (MTA) or a Lotus or third-party gateway to transfer mail to non-Notes mail users or to the Internet. Okay, there was more to it than that, but not much more.

Beginning with R5, there is much more to it. Lotus has incorporated SMTP mail routing into the mail router. This complicates the mail routing setup process, because now we have to choose the degree to which (if at all) we use SMTP ...

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