lastday rebooted my server . after that some mail's are failed . error show's like follow's ...... while we send the mails to some where ...
Sep 10 10:31:35 XXXX postfix/smtpd: warning: 188.8.131.52: hostname client-184.108.40.206.speedy.net.pe verification failed: Name or service not known
what's the problem ? .how to solve this one ? . please any can help me