Open source alternatives to ZeroBounce

One project on starwire does the same job. Ranked by how much of what ZeroBounce does each one covers, read from its README and website. Ties go to the most active.

What ZeroBounce does

Verify email addresses are deliverablecore
Bulk email list cleaningcore
Real-time verification API
Spam trap and disposable address detection
Email scoring
Integrations with email tools

Each dot in the table is one job, in this order. Square dots are core jobs and count double. Full means yes, half means partly. "See the evidence" under a project shows the line behind each one. Coverage is what a project documents, not how well it works or how hard it is to move to. How we score this

Project	Covers	Stars	Commits, 12 weeks	Last release	Closed vs opened	Setup	License
check-if-email-existsChecks whether an email address exists without sending mail, with an HTTP API	Covers one part49%	10k+53	22	15 days ago	100%	Hosted version	MIT
Covers 1 of 2 core jobs. Partly: Spam trap and disposable address detection; Email scoring. Not shown: Bulk email list cleaning; Integrations with email tools.See the evidence Verify email addresses are deliverablecoreYesCheck if an email address exists without sending any email Bulk email list cleaningcoreNot shownNeither the README nor the website mentions it. Real-time verification APIYesComes with a ⚙️ HTTP backend Spam trap and disposable address detectionPartlyDisposable email address (DEA) validation Email scoringPartlyCan be one of safe, risky, invalid or unknown Integrations with email toolsNot shownNeither the README nor the website mentions it.

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