found 940027 courier-mta/0.76.3-5+deb9u1 thanks+1 for this bug. I confirm that courier-msa (note MSA not MTA) doesn't stop correctly when using sysvinit and the reason is a missing PIDFILE=... line in the init script.
This is probably related to #860777, but I didn't actually look at the changes in that release to confirm.
-- Ciao, Flavio Those who do not understand Unix are condemned to reinvent it, poorly. -- Henry Spencer
