Just changed outgoing mail server now unable to Send to old contacts

Please see error message below:
"This message could not be delivered and will remain in your Outbox until it can be delivered.
The server "smtp.snet.net" did not recognize the following recipients:"
These however are all address that I have previously mailed to and are suddenly not working.
Thanks for the help. Please reply to [email protected]
Karen

Howdy andy237,
The article linked below details how to go about using Connection Doctor in Mail to determine the cause of your outgoing mail servers being offline, as well as detailing methods for resolving the issue.
OS X Mail: Troubleshooting sending and receiving email messages
http://support.apple.com/en-us/TS3276
Cheers,
Allen

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Just changed outgoing mail server now unable to Send to old contacts

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