On Wed, Mar 13, 2024, Harald Hannelius via mailop wrote: > Are there SMTP-"clients" that actually are able to back down from STARTTLS > and continue unencrypted?
Very unlikely. If the TLS handshake fails, a server usually drops the session because it is in an unknown state. What several clients can do is to try a new session without STARTTLS, e.g., TLSFallbacktoClear If set, sendmail immediately tries an out- bound connection again without STARTTLS af- ter a TLS handshake failure. -- Please don't Cc: me, use only the list for replies, even if the mailing list software screws up the Reply-To header. _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop