sender-reputation

Bulk email verification & bounce rate checker. Verify email lists, reduce bounces, clean CSV files. 9-point verification engine. Free tools + 5,000 free credits. Powered by Mailthentic.

Free email deliverability & inbox placement guide — multilingual edition. Check if your campaigns land in spam.

Bulk verify email addresses in Python — syntax, MX, mailbox, disposable, risk score. Cleans your list before sending.

Return Path is an email-deliverability and inbox-intelligence brand that pioneered sender reputation, inbox-placement monitoring, and email fraud protection for marketers and email senders.

Open-source consent-based private email warmup network and deliverability dashboard

Habeas was an email reputation and deliverability services provider that helped legitimate senders monitor and manage their sending reputation to maximize inbox deliverability, using a trademark-based accreditation and safelist model to certify permission-based email.