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Old 04-12-2017, 05:57 AM   #1
TheIndependentAquarius
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Lightbulb How do MUAs, MTAs, and MDAs talk to each other?


https://web.archive.org/web/20150709...A-MTA-MDA.html

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

If on host2.uiuc.edu, this diagram is valid,
MTA -> MDA -> MUA

then shouldn't this diagram be valid on host1.uiuc.edu:
MUA -> MDA -> MTA

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, 01:31 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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