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Open Eudora and do one of the following:
a. Click on the Eudora Menu and select Preferences.

b. Click on the Special Menu and select Settings.

Click on Sending Mail category on the left column

Change SMTP Server from "smtp.clarityconnect.com" to "smtp-relay.clarityconnect.com". Make sure that the small box next to Allow Authentication is
checked.

Click OK button to save the new setting.
The change is now complete. You should be able to send messages again. If you are still not able to send, please restart your computer.