mail, webmail, ftp NOT working suddenly !

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This is one of these days!!

Until yesterday, my new virtuozzo VPS (one active domain only) was working perfectly. I had just transferred my site there, waited for the DNS servers to be informed of the nameservers change I made, waited and after some hours it worked.
Some people could not see my site yet but I thought it was a matter of time.

This morning I started my mail client to receive mail, and it says tha it cannot find the mail server. The website works OK, my forum works OK (mysql).

Webmail does not work !
"Server not found
Firefox can't find the server at webmail.MYDOMAIN.com."

Ftp doesn't work!

Tried to restart qmail from the Virtuozzo and Plesk panels, failed. Top command shows it as running.

/etc/init.d/qmail status returns

[root@server root]# /etc/init.d/qmail status
warning, got duplicate tcp line.
warning, got duplicate tcp line.
warning, got duplicate tcp line.
warning, got duplicate tcp line.
warning, got duplicate tcp line.
qmail is stopped

Can you help? All of the above (mail, webmal, ftp) were working perfectly until some hours ago. I did not touch anything !
Thank you,
Dimitris

 

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Update.

Friends with different internet providers of me, tell me that Webmail is working.

Another friend tells me that he cannot see my site (60 hours after the nameservers changed).

Does it sound like a DNS problem?

Thank you.
Dimitris