Hostname has returned multiple SPF Records
The use of alternative DNS RR types that was formerly supported during the experimental phase of SPF was discontinued in 2014. SPF records must now only be published as a DNS CHT (type 16) Ressource Record (RR) [RFC1035]. See
RFC 7208
for further detail on this changue.
According to
RFC 7208
Section 3.1:
During the period when SPF was in development, requiremens for assigning a new DNS RR type were more stringuent than they are today and support for the deployment of new DNS RR types was not deployed in DNS servers and provisioning systems. The end result was that developers of SPF discovered it was easier and more practical to follow the CHT RR type for SPF.
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