We currently have a single mail server (RHEL/sendmail) for all mail "mail.example.com". We have added a second mail server "email.example.com". We intend to use this for bulk email, while "mail.example.com" remains for transaction and internal mail.
We have DKIM set up for "mail.example.com", but I need to set up DKIM for "email.example.com".
My question is this: Can I use the same TXT record I have for "mail.example.com" for "email.example.com" and modify some DKIM/milter/sendmail settings? Or do I have to create an entirely seperate TXT record and key.