DNS
TXT record setup for verification and email authentication
A TXT record is a flexible DNS record type used by many services. Because several unrelated systems can require TXT data on the same domain, the main risk is replacing an existing record or putting a value at the wrong hostname.
Copy both the host/name and value
A provider may ask for a record at the zone apex, a selector such as `_dmarc`, or another specific label. Putting the right value at the wrong name will not satisfy the service checking it.
Do not delete unrelated TXT records
A domain may already have verification, SPF, DKIM-related, DMARC, or application records. Adding a new service usually does not mean replacing every existing TXT entry.
Watch provider-specific formatting in DNS interfaces
Some interfaces automatically append the zone name or handle quotes internally. Verify the resulting DNS answer rather than judging success only from how the control panel displays the input.
Remove obsolete verification deliberately
Old records can create clutter and sometimes policy confusion. Keep an inventory of which service owns each TXT value so decommissioning a service includes DNS cleanup.