smtp servers not responding

Hi

Currently I have this error messages in default log

[05/Jun/2007:11:55:25 +0800] mx3 msprobe[26215]: General Error: function=getserverresponse|port=25|error=failed to connect

[05/Jun/2007:11:55:25 +0800] mx3 msprobe[26215]: General Critical: SMTP server is not responding

Do you guys know how to resolve this problem?

Thanks

[365 byte] By [haw_9368a] at [2007-11-27 6:24:52]