DNS SOA Record stands forDomain Name System (DNS) Start of Authority (SOA) Record and contains administrative information about a domain or zone.
SOA records contain administrative information such as the name of the domain or zone, serial numbers, and refresh information. DNS servers are often set up in clusters with master and secondary DNS zones to allow for DNS redundancy on a network to prevent total outages.
In order for the DNS zones to stay in sync, they perform zone transfers. The information provided within an SOA record such as the serial number and timing information for refresh, retry, and expiry enables the synchronization.
An SOA record will also contain the email address of the administrator of that zone to communicate issues.
Though the email address in RNAME is written as admin.menandmice.com, which is correct in this case, it stands for email@example.com. The @ sign is not possible in this contect within the record.