The open file descriptor limit (C<RLIMIT_NOFILE>, C<ulimit -n> in L<sh(1)>,
C<LimitNOFILE=> in L<systemd.exec(5)>) may need to be raised to
-accomodate many concurrent clients.
+accommodate many concurrent clients.
Transport Layer Security (IMAPS, NNTPS, or via STARTTLS) significantly
increases memory use of client sockets, sure to account for that in