503 AUTH command used when not advertised

I am not receiving any email form Discourse even after successful setup in Ubuntu 18 LTS.

when i ran ./discourse-doctor from /var/discourse directory and send email to my a/c I am receiving below error.

503 AUTH command used when not advertised

How to resolve this error.
Thanks in advance.

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See discourse/INSTALL-email.md at master · discourse/discourse · GitHub

And Troubleshooting email on a new Discourse install

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I am using my own SMTP server and able to send email from telnet