If the server doesn't allow SMTP Authentication then you should ask the customer to POP their email before trying to send them.Īpart from SMTP Authentication, there are some more causes of this error, the causes as well as their solutions are detailed in the text ahead.ġ. ![]() ![]() Finally Click on OK then Click on Next and then Click on Finish. Choose the " Use same settings as my incoming email server"ħ. Here choose the box “ outgoing server (SMTP) requires authentication”.Ħ. Click on " More settings" and choose the " Outgoing Server" tab.ĥ. Now choose the particular Email account and then click on “ Change”.Ĥ. Choose " View or change existing e-mail accounts" and then Click on " Next".ģ. Click on Tools and then Click on E-mail Accounts in the Menu Bar (In Outlook 2010 or Newer, Select Email Account by going to Menu Bar then File then Info Tab and then Account Settings).Ģ. Step by Step process for SMTP authentication in outlook is given below :-ġ. One should enable the SMTP authentication in cPanel/WHM servers for the email account to resolve this error. ![]() If the mail sender has not configured the Outlook properly for outgoing email like SMTP and also not connected with POP server just before sending email then you will face such kind of issues. In WHM Servers, one can do the authentication by SMTP or POP-before-SMTP Authentication. The meaning of this error is that the server can't accept the email due to wrong SMTP connection authentication. This error generally occurs for those servers in which have enabled SMTP Authentication. Outlook Users who access their Email Accounts that are hosted on Servers faces an error "Error 503 Valid RCPT Command Must Precede DATA" while trying to send emails.
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