Domains with DNS TXT v=spf1 include:_spf.google.com include:spf.nsgroupllc.com include:relay.mailchannels.net -all
There is 1 domain that have DNS TXT set to v=spf1 include:_spf.google.com include:spf.nsgroupllc.com include:relay.mailchannels.net -all.