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   Reason for the error : In my …

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