We're in the process of configuration our ESA setup and have a question with regards to encrypting SMTP transactions.
Our current SMTP setup required users to select "SSL/TLS" in their (for example) Thunderbird config: the SMTP transaction is encrypted from the get to, the TLS connection being negotiated first.
With the ESA, we have only managed to get an encrypted SMTP transaction working via STARTTLS: the transaction starts out in the clear, before the TLS connection is negotiated.
My question is, can we set up the ESA to require a TLS connection without using STARTTLS? This would mean not having to reconfigure all our users SMTP configurations...
Thanks for your advice!
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