qmail doesn't send queue

[shyper]

Hi, i have a big problem. One of our big customers are sending mails to a specific mail-domain. Many of them stuck in the queue for a long time. If i try to send a mail with telnet anything works as excepted.
To solve the problem i've tryed to relay it through our second server. But some of them even stuck on the second. If I run 'ps aux' i see that there is /var/qmail/bin/qmail-remote.moved hanging in the list with exact the mail.
In the logfiles the last actions are:

Feb 18 13:03:01 za17 qmail-remote-handlers[18848]: Handlers Filter before-remote for qmail started ...
Feb 18 13:03:01 za17 qmail-remote-handlers[18848]: from=[SENDER]
Feb 18 13:03:01 za17 qmail-remote-handlers[18848]: to=[RCPT]
Feb 18 13:03:01 za17 qmail-remote-handlers[18848]: hook_dir = '/opt/psa/handlers/before-remote'
Feb 18 13:03:01 za17 qmail-remote-handlers[18848]: recipient[3] = '[RCPT]'
Feb 18 13:03:01 za17 qmail-remote-handlers[18848]: handlers dir = '/opt/psa/handlers/before-remote/recipient/[RCPT]'

The problems began as we switched to a new server with debian etch (upgraded to lenny) and plesk 9.3.0.
Hope to get some help or information.

Thanks!

 

[IgorG]

Do you have installed latest Plesk 9.3.0 micro update for Qmail? Install it and check this problem again.

 

[shyper]

Yeah, i've installed it. But it still doesn't help.
The problem occurs only for one recipient-domain. Everything else is working fine.
I think the problem is the qmail-remote.moved because this process is hanging in the process-list.

 

[IgorG]

Try to stop/kill all qmail processes, start it again and rebuild mailsettings with 'mchk --with-spam'.

 

[shyper]

Okay, i've stopped qmail and xinetd, killed all qmail processes, started qmail & xinetd and did /opt/psa/admin/sbin/mchk --with-spam
Then i told qmail to flush his queue and again: the process qmail-remote.moved

[Edit:]
Problem not solved and many mails to one domain are hanging in the queue & process-list (qmail-remote.moved).

 

[shyper]

Some aditional info: i've relayed the mail for the problem-domain to our second server (same installation as mainserver, but less mail-traffic). There i found this error in the logs after about an hour:

delivery 65: deferral: Connected_to_188.201.19.107_but_connection_died._Possible_duplicate!_(#4.4.2)/

But not every mail get this error. Some hanging for over two days.
Hope this can help.