Email address checker
Before adding a contact to your list, see what the address says about itself: format, domain, mail servers and risk signals. Everything verifiable, without sending a single email.
The check runs in your browser (the domain lookup goes through DNS-over-HTTPS). We don't store the addresses you enter.
What it checks (and what it doesn't)
This tool runs only deterministic checks: things that can be verified with certainty from your browser. What can't be verified — whether the inbox exists and someone reads it — we tell you instead of faking it.
Syntax
Whether the address follows the standard rules: allowed characters, dots, maximum lengths.
Domain and MX records
Whether the domain exists and declares mail servers. Without MX, delivery almost always bounces.
Disposable inboxes
Detects the most common temporary email services: contacts that vanish within hours.
Role accounts
info@, sales@, support@: department inboxes, not people. They tend to perform poorly in campaigns.
Typos
If the domain looks suspiciously close to a popular one (gmial.com, hotmal.com), it suggests the correction.
Frequently asked questions
No — and no tool can honestly promise that: major providers (Gmail, Outlook, Yahoo) don't reveal whether an inbox exists, precisely to stop address harvesting. What we do verify is everything that can be checked deterministically: format, domain, its mail servers and risk signals.
Because it's bad practice and creates false certainty. SMTP probes against arbitrary targets are the technique spammers use to "clean" purchased lists: providers detect them and penalize the sender's reputation.
The result also isn't deterministic: many servers accept any address (catch-all) or respond differently depending on who asks. We prefer verifiable checks and telling you clearly what's left out.
These are temporary inboxes (Mailinator, YopMail and similar) created in seconds and gone within hours. If they get into your list, they inflate your contacts with people who will never read you and drag down your metrics. Worth filtering them out at signup.
Because info@ or sales@ is read by a department (or no one), not a person who subscribed. In marketing campaigns they tend to have low open rates and more spam complaints. They aren't invalid — they're addresses to use with judgment, better suited to transactional or one-off B2B communication.
For one-off cases, yes: the contact you added by hand, the address you suspect was mistyped. Cleaning a whole list is a different job entirely: it comes down to capturing contacts with confirmation, and sending from a platform that tracks bounces and unsubscribes in your stats, like arrobaMail does.
A healthy list starts at signup
Checking addresses one by one is useful for the doubtful cases; a healthy base is built by capturing contacts who genuinely want to hear from you and measuring what happens afterward. Check out the metrics calculators to interpret bounces and unsubscribes, and the guide on why emails land in spam.
A healthy list deserves campaigns to match
In arrobaMail, bounces and unsubscribes are tracked automatically and reflected in your stats: your list stays clean while you focus on campaigns. Try it free, no card required.
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