This is pretty common because there are few tools that mail administrators have to combat spam and phishing attacks, and this is one of the better ones. Not ju

This is pretty common because there are few tools that mail administrators have to combat spam and phishing attacks, and this is one of the better ones. Not just TLDs, but new domains are often frequently treated as suspicious as well. For whatever it's worth, your delivery rate will improve over time as it gains positive reputation.