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email-tester
3 plugins
ZeroBounce Email Verification & Validation
Need an email validation tool to block invalid and high-risk emails on your WordPress website?
Automatic Email Testing for WP
[UPDATED!] Automatic Email Testing for WP plugin allows you to set up a system inside wordpress to test your email server every day.
Email Checker
Prevent spam signups by bots and lost customers in comment, registration, and contact forms using Email Checker's Email Verification Plugin.