پلگ ان ٽيگ: email tester
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ZeroBounce Email Verification & Validation
ZeroBounce validates emails on your WordPress site in real-time, blocking invalid and risky emails to improve deliverability and reduce bounce rates.
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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.
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Email Checker
Prevent spam signups by bots and lost customers in comment, registration, and contact forms using Email Checker's Email Verification Plugin.