Select the Sending Mail icon.
In the Secure Sockets when Sending section select "Never".
Setting
the SSL Certificates
To be able to send e-mail you first must download e-mail. Download and
receive the error that the certificate is not trusted.
From the Tools menu open the Options window and select the Checking
Mail icon.
Select the Last SSL Info button. The SSL Connection Information window
will open.
Select the large Certificate Information Manager button.
Select the Add To Trusted button.
Click Done then click OK.
You may need to quit Eudora and restart it for the new settings to work.