That's a bit more complicated.

ssl:// = client uses a dedicated port for these connections and directly start talking encrypted to the server (negotiate encryption ciphers)

tls:// (in fact, it's not tls by itself, but STARTTLS) = client uses the regular unencrypted port, start talking in plain unencrypted text saying "STARTTLS" which means "I want to talk to you in an encrypted tunnel" and only then start talking encrypted (negotiate encryption ciphers)

both  postfix and dovecot support both methods. There are a lot of good tutorial on internet for their configuration.

Le 16/12/2015 03:17, Paul Schreiber a écrit :

On Tue, Dec 15, 2015 at 9:08 PM, Zhang Huangbin <zhb@iredmail.org> wrote:

> (2) Would/can you ever use tls:// with IMAP? In which cases?
> (3) Why would SMTP fail with ssl://?

Do your SMTP and IMAP servers support them?

 

I'm using Dovecot and Postfix. Postfix seems to support TLS and Dovecot SSL, but not vice-versa. I'm wondering what the distinction is when it comes to Roundcube.

 

In general terms, TLS is the new version of SSL, which is why this UI/terminology is confusing.

 

 

Paul

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