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Mails to remote recipients stuck in queue, please help.

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PremF

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I'm using Plesk 9.3.0 with Qmail on Redhat el5.
By now, all mails to remote recipients which are sent from my server stuck in queue (local mail sending/receiving is fine).

I see many lines of this error in maillog:
deferral: Sorry,_I_wasn't_able_to_establish_an_SMTP_connection._(#4.4.1)/

Port 25 of my server is working fine. So I'm quite confuse about the cause of that error.

How should I do to solve this? Please suggest.
 
I'm using Plesk 9.3.0 with Qmail on Redhat el5.
By now, all mails to remote recipients which are sent from my server stuck in queue (local mail sending/receiving is fine).

I see many lines of this error in maillog:
deferral: Sorry,_I_wasn't_able_to_establish_an_SMTP_connection._(#4.4.1)/

Port 25 of my server is working fine. So I'm quite confuse about the cause of that error.

How should I do to solve this? Please suggest.
I have a same problem.
How do you solve this ?
 
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