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The Ultimate in Dedicated Servers

We want to briefly mention the concept of separating SMTP from IMAP; that is, using separate machines to perform IMAP access to the mailstore and SMTP routing. In this separate server scheme, the SMTP router uses Local Mail Transport Protocol (LMTP) to talk to the IMAP server, as shown in Figure 14-5 .

FigureÂ 14-5.Â Separate SMTP and IMAP servers

That way, the IMAP server doesnât spend cycles and I/O bandwidth on managing an SMTP queue. This scheme is already being used successfully by a few early adopters and is beginning to be used more widely.

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