SMTP error from remote mail server after MAIL FROM

I'm trying to set up a business email, so I made a new email adress via my cpanel.

I managed to add the mail to my mac mail app client, but I can't send nor receive emails.

Whenever I send an email from my personal account, it doens't arrive.

Whenever I send an email from my bussiness email, I immediately get a mail that says:
Mail delivery failed: returning message to sender

This is what is says in the mail:

Code:

(P.S. I switched out the actual email with name@bussinessemail and personalemail@hotmail.com)

This message was created automatically by mail delivery software.

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:

personalemail@hotmail.com
host filter.example.nl [185.56.xxx.xx]
SMTP error from remote mail server after MAIL FROM:<name@businessemail.com> SIZE=2390:
550-Verification failed for <name@businessemail.com>
550-Previous (cached) callout verification failure
550 Invalid sender <name@businessemail.com>