In the IMAP Server in Dovecot 2.3.3 through 18.104.22.168, the submission-login service crashes when the client disconnects prematurely during the AUTH command.
Created dovecot tracking bugs for this issue:
Affects: fedora-all [bug 1709245]
No builds for F30 to fix this. I asked several times in bug #1672622, but no action has been taken there.