unable to send mail to external domains

[JishnuR]

Hi,

I am unable to send mails to external domains, it was working about 5 days back.
Here is what i get from my mail log

Oct 22 10:24:14 s16454420 postfix/smtpd[5521]: CD28116E7F: client=server205-3.live-servers.net[xx.xx.xx.xx], sasl_method=LOGIN, [email protected]
Oct 22 10:24:14 s16454420 postfix/cleanup[5945]: CD28116E7F: message-id=<[email protected]>
Oct 22 10:24:14 s16454420 postfix/cleanup[5945]: CD28116E7F: milter-reject: END-OF-MESSAGE from server205-3.live-servers.net[xx.xx.xx.xx]: 4.7.1 Service unavailable - try again later; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<www.domainname.co.uk>

This is a very grave issue as lots of emails should be going out of this server, please suggest a solution

 

[abdi]

Bee here already?

http://kb.parallels.com/en/114982
http://forum.parallels.com/showthread.php?t=208771