Since Sendmail was a very popular MTA for a long time, Postfix (and I assume Exim too, correct me if I'm wrong) wanted to maintain its compatibility with it, so they created an emulation layer that allows interaction with the Sendmail commands.
It's akin to the 'newaliases' command!
E is correct
"All MTAs intend to be drop-in Sendmail replacements, so all Sendmail-compatible applications should work regardless of what MTA is being used."
source: LPIC-1 (102) (Version 5.0), page 341
upvoted 4 times
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