Domains with DNS TXT v=spf1 +a +mx +include:spf.smtp2go.com +include:spf.v6send.net ~all

There is 1 domain that have DNS TXT set to v=spf1 +a +mx +include:spf.smtp2go.com +include:spf.v6send.net ~all.

Top Domains with TXT set to v=spf1 +a +mx +include:spf.smtp2go.com +include:spf.v6send.net ~all