Email not working after domain name mapping

Searching Google (“553 sorry, that domain isn’t in my list of allowed rcpthosts”), the links all seem to refer to similar solutions as this: https://sitetechsupport.com/component/qbblog/entry/general-email-related-articles/64-solution-to-a-common-email-error-553-sorry-that-domain-isnt-in-my-list.html

Searching Google (“553 sorry, that domain isn’t in my list of allowed rcpthosts”), the links all seem to refer to similar solutions as this: https://sitetechsupport.com/component/qbblog/entry/general-email-related-articles/64-solution-to-a-common-email-error-553-sorry-that-domain-isnt-in-my-list.html

That cannot be it. I’m able to send emails to other accounts just fine. If it was the outgoing email server issue, I shouldn’t be able to send emails to other accounts.

I found out the culprit.

It turns out that you need to make new “MX” entries in the hosting site.

So, is everything working as it should?
If so, you could mark this thread “Resolved”.

How do I mark this thread resolved?

There’s a checkbox under the text entry field, as well as a dropdown on the sidebar.