New wi-fi connection - can no longer send e-mail

K

ktwo_online

G4 PowerMac running OS X 10.2.8. Entourage X for Mac.

Just switched from USB ADSL modem Internet connection to a wireless
router Internet connection. Can access the Internet fine via browsers
and can receive e-mail OK. Just can't send e-mail. Entourage
immediately gives the following error message:

Error

Mail could not be sent using the account "account name."

Explanation

Mail error. The server did not understand the request.

Error 5554

Anyone got any ideas????
 
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