Re: STARTTLS support

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On Wed, 5 Nov 2025 01:10:10 +0200 Nerijus Baliunas via Mahogany-Users <[email protected]> wrote:

NB> Another question about SMTP - does it support STARTTLS?

 Yes, I've used it in the past (with Exim but it shouldn't matter). I could
retest it again, but I don't think anything has changed in this code since
a very, very long time...

NB> I entered localhost:587 as SMTP server, chose SSL/TLS for SMTP server:
NB> "Use TLS if available", but sending fails:
NB> 
NB> Error: Mail log: TLS/SSL failure for localhost: SSL negotiation failed
NB> Error: Mail log: Unable to negotiate TLS with this server: localhost
NB> Error: Failed to send the message.
NB> 
NB> postfix log:
NB> 
NB> connect from localhost[127.0.0.1]
NB> SSL_accept error from localhost[127.0.0.1]: lost connection
NB> NOQUEUE: lost connection after STARTTLS from localhost[127.0.0.1]
NB> disconnect from localhost[127.0.0.1] ehlo=1 starttls=0/1 commands=1/2

 So it does send STARTTLS, but it looks like it can't negotiate TLS
parameters. Perhaps it only supports old TLS version which is disabled in
Postfix now? This wouldn't be surprising (and might be pretty difficult to
fix, unfortunately), so if you can enable older (and less secure) TLS
support in Postfix, you probably will have to do this.

 Sorry,
VZ

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