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I am afraid this is unfixable (or more precisely not worth the fix) at the moment.

There are two systemd services bind together, both forking. The PID file is written in the child process, not the parent, that's why systemd has to use notify + timeout to get the PID file.

In the past we tried:
a) moving write PID from the child to the parent process
b) patching sendmail to provide same functionality in the non daemon mode as in the daemon mode and switching systemd services to non-forking mode

Both weren't trivial patches and both were rejected upstream. Not counting that fast consecutive restarts of mail server aren't typical use case.

Development Management has reviewed and declined this request. You may appeal this decision by reopening this request.