You know the drill. A customer complains their transactional emails land in spam. Or a B2B trial signup uses a throwaway address. Or someone asks "do we have DMARC set up correctly?" and you open ten browser tabs to find out.

I built MailSec to replace that entire workflow with one API call.

The problem

Email infrastructure is deceptively complex:

SPF has a hard 10-lookup limit that silently breaks when you add one too many include:

DMARC with p=none does literally nothing — but most teams ship it and assume they're protected

DKIM selectors vary by provider ( google , selector1 , k1 , s1 ) and you need to guess which one to check

Spamhaus listings can tank your deliverability for days before anyone notices

DNSSEC is either there or it isn't, and most tools make you check separately

The information is all in DNS, but it's scattered across different record types, different query tools, and different mental models.…