How to Fix “SMTP AUTH Is Required for Message Submission on Port 587” in cPanel Server

If you are seeing the below error in the exim_mainlog, then the fix is below.

Error: SMTP AUTH Is Required for Message Submission on Port 587

Sample Error log 

2020-05-08 09:42:08 H=(domain.com) [58.162.228.40]:59624 F=emailid@domain.com rejected RCPT test@gmail.com: SMTP AUTH is required for message submission on port 587

cPanel Server Management

 

Reason for the error :

In my opinion, this is a good setting to have a secure way of email transactions and will suggest to keep it on if possible.

 

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