TO enable SMTP authentication in EUDORA please folow the followinig steps :-
1. OpenEudora email client.
2) Click on"TOOL" menu and then click on"OPTIONS".
3) Under theCategory heading on the left, clickSending Mail .
4) SelectAllow authentication on the right side of the Options window.
You can also do this for your personalities underTools>> Personalities.
Note: Eudora uses the login name specified on the Checking Mail configuration option,
which is in the format of username@yourdonain.com.
5) Change Secure Sockets When Sending at the bottom of the window to Never.
6) Click OK.
Your "SMTP Authentication" has been enabled in theEUDORA.
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