Domains with DNS TXT v=spf1 a mx include:spf.mtasv.net include:sendgrid.net include:spf.simplia.cz include:_spf.google.com -all
There is 1 domain that have DNS TXT set to v=spf1 a mx include:spf.mtasv.net include:sendgrid.net include:spf.simplia.cz include:_spf.google.com -all.