Changed: a Mail domain using records at its DNS provider lists its records in one table: type, name, value with a Copy button, and status. The MX row shows the domain's current MX records.
The domain is verified when its page opens and the verification record is found, so there is no separate verification button. The verification value stays the same and is always shown. Check again sits beside the table it checks. A domain with no mailboxes shows Add a mailbox.