Domains with DNS TXT v=spf1 mx ip4:52.8.60.128 include:postmarkapp.com -all
There is 1 domain that have DNS TXT set to v=spf1 mx ip4:52.8.60.128 include:postmarkapp.com -all.
There is 1 domain that have DNS TXT set to v=spf1 mx ip4:52.8.60.128 include:postmarkapp.com -all.