The server refused the test recipient with error b 5.7.1 Sender address rejected: not owned by user

Question

Trying to get outbound SMTP working on a fresh Odoo 12 setup on Ubuntu 18.04 LTS.

Go to Settings > General Settings > Outgoing Mail Servers > SMTP

Setup server information.
Run Test Connection.
(had to manually modify test template because it was saying noreply@odoo.com rather than our domain when tried this earlier, with same error)
Get the following error message:
The server refused the test recipient (noreply@rpg.llc) with error b'5.7.1 <hawke@rpg.llc>: Sender address rejected: not owned by

Joshua David · Accepted Answer

I fixed this by changing my email address on the user preference page.
Odoo tries to test the new mail server using the current user's email.
Change your current email address from  hawke@rpg.llc to  odoo@rpg.llc to fix the issue.

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