! 1. Introduction
! ...
! messages. In this application, TLS is used only upon mutual
! agreement (successful negotiation) between the client and server; if
! this is not possible, the message is sent unencrypted. Furthermore,
That's not the case for all MTAs. sendmail only recently introduced
an option to allow this:
To automatically handle TLS interoperability problems for outgoing
mail, sendmail can now immediately try a connection again
without STARTTLS after a TLS handshake failure.
This was triggered due to the decision of OpenSSL to enforce some
policy in the library without a simple option to override that and
the resulting delivery problems...
Before that, mails would get stuck in the queue and hopefully get
the attention of a postmaster to fix the interoperability problem.
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