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Last updated: 14/01/2016
Within a domain name zone, a TXT record is used for keeping text information.
Virtually anything can be added in a TXT entry, but common uses are SPF (Sender Policy Framework) records, used to identify your outgoing mailservers, and DKIM (DomainKeys Identified Mail) or Sender ID records.
A TXT record always has a hostname so you can assign the text information to a hostname.