Plesk: outgoing mail is not working

Hello,

I'm having some problems with one of my Plesk servers. It seems that mails generated from the server don't go out. My maillog is full of similar messages:

Sep 8 17:22:20 www qmail: 1063059740.553855 status: local 0/10 remote 15/20
Sep 8 17:22:20 www qmail: 1063059740.568078 delivery 3: deferral: Sorry,_I_wasn't_able_to_establish_an_SMTP_connection._(#4.4.1)/
Sep 8 17:22:20 www qmail: 1063059740.568280 status: local 0/10 remote 14/20
Sep 8 17:22:20 www qmail: 1063059740.568312 delivery 4: deferral: Sorry,_I_wasn't_able_to_establish_an_SMTP_connection._(#4.4.1)/
Sep 8 17:22:20 www qmail: 1063059740.568354 status: local 0/10 remote 13/20
Sep 8 17:22:20 www qmail: 1063059740.568445 starting delivery 17: msg 876319 to remote postmaster@www.class.ro
Sep 8 17:22:20 www qmail: 1063059740.568488 status: local 0/10 remote 14/20

I have tried to restart qmail, the whole server, but it doesn't seem to work.

Any suggestion would be welcome.

 

 

 

 

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