Error :”550 THIS MAIL SERVER REQUIRES AUTHENTICATION” in MailEnable

kumkumsharma

Administrator
Staff member
If you are getting below error then you can resolve this error by following below steps:

550 This mail server requires authentication (0) when attempting to send via this SMTP (submission) port

The main reason of this error is if we configured mailenable to force all inbound connections to authenticate.

Here are the steps to resolve this error:
  • Login to mailenable.
  • Click on “Servers >> Localhost >> Service and Connectors >>SMTP.
  • Here right click on it and select “Properties”.
  • Select “Inbound” tab.
  • Under port settings section click on “Settings
  • Untick the option “Requires connections to authenticate before sending email” from SMTP port and Submission port, click on “Ok”.
  • Now restart the SMTP service.
 
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