Sending emails after after your email was hacked

[ChrisG1295]

My email was hacked and know when I send out an email this delivery

"Your message couldn't be delivered because you weren't recognized as a valid sender. The most common reason for this is that your email address is suspected of sending spam and it's no longer allowed to send email. Contact your email admin for assistance."

[#2]

Hi, send this to your administrator https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/removing-user-from-restr...