Question and response
Question
dig _spf.firebasemail.com. TXT
Answer
_spf.firebasemail.com. 300 TXT "v=spf1 include:sendgrid.net include:_spf.google.com ~all"
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0