_spf.firebasemail.com DNS history

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First observed
SOA +1 -0
+ firebasemail.com 300 SOA ns-cloud-c1.googledomains.com cloud-dns-hostmaster.google.com 4 21600 3600 1209600 300
TXT +1 -0
+ _spf.firebasemail.com 300 TXT "v=spf1 include:sendgrid.net include:_spf.google.com ~all"