Email Notification

I set up a box with my own domain to send the invoices and I get the following error in gmail, can you help me?

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

[email protected]
host smtp.mailchannels.net [34.213.25.210]
SMTP error from remote mail server after end of data:
550 5.7.1 [BFD] Sender prohibited by SPF

It seems your email address is not verified, you should use Google find resources and solutions.