I have been using phpfusion for about 2 months now without any problems. However today I had members recieving the following error

Warning: fsockopen() [function.fsockopen]: php_network_getaddresses: getaddrinfo failed: Name or service not known in /home/australi/public_html/includes/smtp_include.php on line 106

Warning: fsockopen() [function.fsockopen]: unable to connect to australianonlinepokerleague.com:25 in /home/australi/public_html/includes/smtp_include.php on line 106

I have not changed any settings.
The only thing I can see is that my webhost changed servers a few days ago. I have seen posts about this problem and have tried what is mentioned but no luck.
I have emailed the webhost but am still waiting for a reply to see if the port has changed.
Is there anything elseI can do at this stage?