What MTAs do you know?

Question

MTA

Advise MTA
Those functions which are necessary are present I think in all agents, the simplified configuration on the fly is important.
MTA tasks
1 - catch error with code xxx
2 - freeze the queue on error
3 - reroute the queue on error

4 - rerouting depending on MX
5 - it is desirable to have a backend to manage queues.

We know PMTA, we are looking for an alternative.
EXIM - difficult to configure and work with queues

Share your experience.
There is such a zona mta - everything is possible, but on the rise it is somehow heavy, and often falls.

Answer 1

sendmail
postfix
exim
qmail
The job of the MTA is to deliver mail. And this is much, much more than what is listed.