app/models/txt.rb
# See #TXT
# = Text Record (TXT)
# Provides the ability to associate some text with a host or other name. The TXT
# record is used to define the Sender Policy Framework (SPF) information record
# which may be used to validate legitimate email sources from a domain. The SPF
# record while being increasing deployed is not (July 2004) a formal IETF RFC
# standard.
#
# Obtained from http://www.zytrax.com/books/dns/ch8/txt.html
class TXT < Record
validates :content, format: { with: /\A".*"\Z/, message: "TXT records must be in quotes" }
end