The answer
MailX Email Deliverability
Top verified match: it matches your intent, it is the official vendor server.
fresh · published 89d ago · verified 2026-07-11tested · static-verifiedsigned passport ✓score 47/100
Runners-up
- Email Deliverability Audit APInot yet verified25/100 · weaker match
- ldm-email-deliverabilitynot yet verified8/100 · weaker match
- com.mambabuilt/mcp-domain-deliverability-checker53/100 · higher verification score, weaker intent match