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Why is mail bouncing with a "Sender address rejected" error?

I have an email that's bouncing with an error that says:

smtp; 554 5.7.1 <>: Sender address rejected: is not allowed to send email to

What's causing this?

This means that the sender's email address (or domain name) is in your Blocked Senders list. To remove the block, login to the control panel and go to Settings > Blocked Senders. From there, click on the checkbox next to the sender's email address (or domain name) and then click on the Delete button.

Last updated April 3, 2023