I am thinking about how to create a "router" (transport for mail) in Exim 
4.x which will allow non-Unix MUAs to send mail normally to the (Exim) SMTP 
server instead of through tmda-ofmipd.

This will simply things on the server side and help with having a single 
system installation. It may also help with performance (?) although that is 
not my goal.

I am looking at the Exim side of things but I have a couple of things I 
need to clarify about tmda-sendmail and how it processes mail. When a Linux 
MUA calls tmda-sendmail it (tmda-sendmail): 

1) runs in system authority context of user account?
2) tmda-sendmail looks at sending user name and processes various 
white/black lists etc. to determine if and how the sender address is 
rewritten? Anything else?
3) tmda-sendmail then sends modified email message to actual MTA, by what 
process? SMTP connection (don't believe it is this) or other means?

TIA

PS

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