Email verifier
Check an address's syntax and that its domain can actually receive mail.
The email verifier confirms whether an address is worth sending to by checking two things you can verify reliably: that the syntax is well formed, and that the domain publishes valid MX records so it can actually receive mail. It also flags role addresses (like info@ or support@) and obvious disposable domains. Catching malformed or undeliverable addresses before a campaign protects your sender reputation and keeps bounce rates low. For the mail domains you depend on, SJ Monitor can keep watching the MX and DNS so a silent change does not quietly break your inbound mail.
Frequently asked questions
Does a valid result guarantee the email won't bounce?
No verifier can guarantee delivery — only the receiving server knows for certain. Checking syntax and MX records removes the most common causes of bounces, which is most of the battle.
What is a role address?
A role address like info@, sales@, or support@ points to a function rather than a person. They often have lower engagement and stricter spam filtering, so many senders treat them with caution.
What does "no MX records" mean?
It means the domain has not published mail servers, so it cannot receive email at all. Addresses at such a domain will bounce.
Can I verify a whole mailing list at once?
The free tool checks one address at a time. Bulk CSV verification of entire lists is a paid feature for cleaning large lists before a send.
Why don't you check the mailbox itself?
A true mailbox probe requires connecting to the mail server on port 25, which many networks (including ours) restrict to prevent abuse. Syntax + MX validation is the reliable, responsible check we run.
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