BounceLens Email Check

Stops fake, mistyped and throwaway email addresses before they reach your user list or your inbox. Runs on your own server: no account, no API key, nothing is sent to BounceLens.

What it catches

• Typos: name@gmial.com gets "Did you mean name@gmail.com?"
• Dead domains: the domain does not exist, has no mail server, or accepts no email (null MX)
• Disposable addresses: Mailinator, 10minutemail and thousands more
• Optional: shared inboxes (info@, sales@), free providers (work addresses only), an allow-list

Where it checks

• User registration and profile: new users and changed email addresses (existing accounts can still be saved)
• The official Contact Form plugin: the sender address
• Control panel: off by default, so administrators can enter any address
• Your own templates: {% set problem = craft.bouncelens.check(email) %} returns the message, or null when the address is accepted
• Your own models: ['email', \bouncelens\craft\validators\EmailCheckValidator::class]

How it works

The domain is looked up with your server's normal DNS (MX, then A). If DNS doesn't answer, the address is accepted, so a slow resolver never locks people out. It can't tell whether a mailbox exists; that needs a conversation with the receiving mail server, which this plugin does not do.

Requirements

Craft CMS 4 or 5. Public user registration needs Craft Pro (a Craft rule, not ours).