I cannot Send an email suddenly - Comes back as Undeliverable

Copper Contributor

My email was working fine, and then suddenly 5 minutes later this error started showing up when I tried sending another email: Please help!! I am also the admin of the group, but I don't know how to fix this as I am obviously not spam, and no one has blocked me. 


Delivery has failed to these recipients or groups:


This message couldn't be delivered because the sending email address was not recognized as a valid sender. The most common reason for this error is that the email address is, or was, suspected of sending spam. Contact the organization's email admin for help and give them this error message.



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