To enable SMTP Authentication in Microsoft Outlook please follow the followinig steps :-
1) OpenOutlook.
2) Select "E-mail Accounts" from the "Tools menu".
3) Select"View or change existing e-mail accounts" .
4) ClickNext.
5) Click on "Email account" and click the "Change button".
6) Click on the "More Settings button ".
7) Click the "Outgoing Server "tab.
8) Place a check in"My outgoing server (SMTP) requires authentication" checkbox.
9) Select "Log on using" and enter your email address in theUsername feild and your
password into the Password field OR if you use your same email address for the
incoming mails also (POP3/IMAP) then select "Use same settings as my incoming
mail server".
10) ClickOK, and then click theNext button.
11) ClickFinish.
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