Cant set my domain mail as default

Cant set my domain mail as default

Hi.

Everytime I press compose, the default email adress is [ old_mail (at) zoho (dot) com ], even after setting the email [ new_mail (at) domain (dot) com ] as the primary adress. This bug is very annoying, can you help me set [ new_mail (at) domain (dot) ] as the default mail. I already tryed every guide without sucess.

Furthermore, can you also add mail.domain.com in my domain list, for logo purposes?

Thank you!!