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Old 04-12-2017, 04:57 AM   #1
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Lightbulb How do MUAs, MTAs, and MDAs talk to each other?

According to the diagram there, MDA is contacting with a MTA. See the arrow.

If on, this diagram is valid,

then shouldn't this diagram be valid on

So, shouldn't that arrow be from MTA to MTA rather than from MDA to MTA?

MUA -> MDA -> MTA <-----> MTA -> MDA -> MUA
Old 04-12-2017, 12:31 PM   #2
Ser Olmy
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I agree.

The diagram shows sendmail on one host forwarding mail to a sendmail instance on another host, and makes the claim that an "internal MDA" inside sendmail is responsible for this. I believe that to be incorrect use of terminology.

As far as I know, the definition of a Mail Delivery Agent has always been software that delivers mail to the mailbox of a local recipient. A Mail Transfer Agent, on the other hand, transfers mail with a non-local recipient to another server for processing.
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