trumail.io
Open source email verification service for checking syntax, MX records, and deliverability through an API.
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anymailfinder.com
Email finding and verification service for discovering business email addresses and checking deliverability.
mxtoolbox.com
MXToolbox tool for analyzing email headers, tracing message routes, and spotting delivery or authentication issues.
hunter.io
Hunter tool for verifying if an email address is valid, deliverable, and safe to use before outreach.
proofy.io
Proofy is an email verification service that checks email addresses before sending. It flags invalid, disposable, catch-all, role-based, and risky addresses to reduce bounces. Verification is offered through bulk list uploads, a REST API, and a free single-address checker.
theseventhsense.com
Seventh Sense provides AI email orchestration and performance management for HubSpot and Marketo, including per-person send-time optimization, deliverability monitoring and audience recycling. It surfaces per-inbox-provider performance and engagement data, with a free start using synthetic data or a connected account.