DOV-3784, CVE-2020-10957: Sending malformed NOOP command causes crash in submission, submission-login or lmtp service. DOV-3875, CVE-2020-10958: Sending command followed by sufficient number of newlines triggers a use-after-free bug that might crash submission-login, submission or lmtp service. DOV-1745, CVE-2020-10967: Sending mail with empty quoted localpart causes submission or lmtp component to crash.