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.
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