luceos
Sorry, this question is from the byobu extension.
I have checked some information and it indicates that there is a problem with the email address, but I tested sending emails on my forum and it works fine, users can receive emails from the email address set in the forum.
I double-checked and modified my domain resolution records, including adding SPF resolution, etc., and I still can't use byobu extension properly.
Requesting support.
😭
