protonmail.com email verification
Check whether an email address at the protonmail.com domain is valid, deliverable and safe to send. Free single checks, no signup required.
5 of 5 free checks left today — no signup required.
Syntax check
Confirms the address follows the correct format for protonmail.com.
MX & domain validation
Verifies that protonmail.com has active mail exchange records.
SMTP mailbox test
Checks the mailbox existence without sending an email.
About the protonmail.com mail provider
Encrypted Swiss provider. SMTP responses are deliberately conservative, so treat unknown results carefully.
- Provider
- Proton
- Type
- Privacy-focused
- Catch-all
- rare
New to verification? Read the complete email verification guide or browse the full domain directory.
Frequently asked questions
How do I check if an email address at protonmail.com is valid?
Enter the address in the verifier above. VeriMailX checks the syntax, resolves the MX records for protonmail.com, opens an SMTP conversation with the receiving mail server and reports whether the mailbox accepts mail — without sending an email.
Is protonmail.com a catch-all domain?
Catch-all configuration is set by whoever administers protonmail.com, and it can change at any time. A live verification tells you whether the server accepted the specific address or accepts everything, which is why catch-all status is reported per check rather than stored as a fixed value.
Can I verify a bulk list of protonmail.com addresses?
Yes. Upload a CSV of up to 50,000 rows per file, or call the API for real-time checks at signup. Results include deliverability status, disposable and role-based flags, and a confidence score for each address.
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