Topic: SMTP Connection Lost

[georgios]

Hello,

today I have a very strange Issue. All my clients could not sent any email through their mail client (Thunderbird), me also !
I had always this message in TB:
"The message could not be sent because the connection to SMTP server mail.serverXX was lost in the middle of the transaction"

The thing is that in the same time :

• I could send and receive from Sogo/Horde
• I could send and receive from my Android/Iphone
• I could receive from my Thunderbird

After rebooting then it was fine, where can I find the issue? (In order to avoid this problem in the future).

many thanks,

[CharlieBrady]

After rebooting then it was fine, where can I find the issue?

Maybe in log files. Maybe, since you have rebooted, you won't be able to diagnose the issue at all. Best time to diagnose a problem is while it actually exists.

Start in your qpsmtpd and/or sqpsmtpd log files - depending on what your Thunderbird configuration was. That is assume that mail.serverXX was actually your SME server, and not some external server.

[georgios]

Yes it is our own mail server, the only one, working for Imaps and SMTP.
in the /var/log/qpsmtpd, I have always the files :

[root@MailSRV qpsmtpd]# ls -la
total 48604
drwxr-s---  2 smelog smelog    4096 30 nov.  05:52 .
drwxr-xr-x 52 root   root     20480 30 nov.  17:59 ..
-rwxr--r--  1 smelog smelog 4998005 25 nov.  06:06 @40000000565533c10de6a994.s
-rwxr--r--  1 smelog smelog 4998011 26 nov.  07:32 @40000000565699792e54f834.s
-rwxr--r--  1 smelog smelog 4998042 26 nov.  08:44 @400000005656aa42154a9d6c.s
-rwxr--r--  1 smelog smelog 4998044 26 nov.  09:52 @400000005656ba47293e5b74.s
-rwxr--r--  1 smelog smelog 4998034 26 nov.  15:53 @4000000056570edd18aceec4.s
-rwxr--r--  1 smelog smelog 4998010 27 nov.  15:49 @4000000056585f6a10e8d98c.s
-rwxr--r--  1 smelog smelog 4998060 28 nov.  03:37 @4000000056590571350ce8e4.s
-rwxr--r--  1 smelog smelog 4998104 29 nov.  09:47 @40000000565aada60dd465cc.s
-rwxr--r--  1 smelog smelog 4998035 30 nov.  05:52 @40000000565bc81d1ed5e5e4.s
-rw-r--r--  1 smelog smelog 4692852 30 nov.  19:02 current
-rw-------  1 smelog smelog       0 10 août  15:42 lock
-rw-r--r--  1 smelog smelog       0 10 août  15:42 state

Do you think I can see something in the two last files from today with looking into these two files?

[CharlieBrady]

Do you think I can see something in the two last files from today with looking into these two files?

Yes, have you looked at 'current'?

[georgios]

Yes, have you looked at 'current'?

Yes but when I looked into the 'current file' or the other one '@40000000565bc81d1ed5e5e4.s' and making a 'grep 'denied' FILE' I only found things regarding Spams...
is that something more else I have to 'search'?

thank you