Warning: fsockopen() error...

...Warning: fsockopen() [function.fsockopen]: php_network_getaddresses: getaddrinfo failed: Name or service not known in /home/path/to/smtp/classes/mail_class.php on line 39


also this:

Warning: fsockopen() [function.fsockopen]: unable to connect to xserve.servername.com:25 (php_network_getaddresses: getaddrinfo failed: Name or service not known) in /home/path/to/smtp/classes/mail_class.php on line 39

AND

Warning: fgets(): supplied argument is not a valid stream resource in /home/path/to/smtp/classes/mail_class.php on line 103


*** The site was working just fine for about a month.
any suggestions?

A server exists in the network [xserve.servername.com]?
Copy lines 3 and 4 of the file mail_class.php,
values that you entered...

Thank you
nameserver was mis-configured.
Used the IP address instead and it worked.