Sumada Kaabaha: email check
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MailCheck.co: Validate emails in one click
VALIDATE YOUR MAILING LIST IN ONE CLICK Be confident your mailing list contains only real emails addresses, get rid of bots and inactive users
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SpoofMail
Validate an email address' structure, check MX-Records and check against known spoof/temporary email domains.
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WP Valid Email
WP Valid Email is a WordPress plugin which offers suggestions to users who mis-type their email address when entering it on your website.
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Server Mail Check
This plugin will send an email out to the administrator of the WordPress site to confirm and check if the server is able to send out an email
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All In One Form Verification
All In One Form Verification by VerifyBee allows you to automatically verify your form submissions.