Type of connection imap: SSL / TLS or simple?

[Erwan]

Hello,

Is there a way to know in maillog if email clients connect in SSL / TLS or in clear?
Thanks a lot.

Erwan

 

[Erwan]

I think i've found...

WITH
imap-login: Login: user=<test@xxxx>, method=DIGEST-MD5, rip=x.x.x.x, lip=x.x.x.x, mpid=31268, TLS, session=<RzILzN1llsMCDqLD
NOT WITH
imap-login: Login: user=<test@xxxx>, method=DIGEST-MD5, rip=x.x.x.x, lip=x.x.x.x, mpid=31268, session=<RzILzN1llsMCDqLD

 

[Erwan]

I've also:

imap-login: Login: user=<test@xxxx>, method=DIGEST-MD5, rip=127.0.0.1, lip=127.0.0.1, mpid=32451, secured, session=<b/Ii/91lsKZ/AAAB

What's the difference between "TLS" and "secured"?

 

[mr-wolf]

Hi Erwan,

Congratulations for finding out the answers yourself AND posting them here. Some post nothing or "never mind, I found it!".

I think (half speculating here) that secured means an SSL-connection.
An SSL-connection is a connection that starts completely secured on TCP-level no actual communication is done before the line is secure.
A TLS-connection starts insecure and then negotiates a secure connection.

An IMAP-SSL connection is port 993 an IMAP-TLS connection is at port 143.

 

[Erwan]

Thanks Mr Wolf...
Last question: can we see the used port in the log file?