Probably your IP-adress has been blocked due to incorrect mail software settings which allow spammers to send messages anonymously.
Provide your server’s administrator with this information to solve the problem.
- Mail servers should be protected from anonymous or unauthorized use.
- The information on authorized user account should be specified in message header.
Received: from username [192.168.10.27]
(Authenticated sender: firstname.lastname@example.org)
by smtp.domain.ru (Postfix)
Thu, 21 Apr 2011 08:58:21 +0400 (MSD)
- Direct connections from web-scripts to Mail.Ru MX-servers are not allowed. Such messages should be sent using local web-serverss MTA or special SMTP-server with SMTP authentication in conformance with preceding paragraphs.
Access will not be granted without adherence of the recommendations.