Syntax and domain evidence
Email Checker: Syntax, MX, and Provider Type
Check one address in two steps: local syntax, then public MX evidence for its domain. The result states plainly what a DNS answer can and cannot establish about an address.
What the check establishes
A well formed address whose domain publishes mail exchangers belongs to a domain that accepts mail somewhere. Free and disposable classifications describe the domain's operator, not the person or the mailbox behind the address.
What it cannot establish
This tool never contacts a mail server, so it cannot verify that the mailbox exists, that the operator will accept your message, or that anyone still reads it. Establishing existence requires an actual delivery attempt.
Use it upstream of real verification
Run this check at capture time to reject typos and dead domains cheaply, then let a confirmation message with a scoped link establish genuine mailbox ownership before you rely on the address.
Questions about this tool
Does valid syntax with MX answers mean the email is deliverable?
No. It means the address is well formed and the domain publishes mail exchangers. Delivery depends on the mailbox, the operator's policy, your sending reputation, and content.
Can this tool verify that an email address exists?
No. Verifying existence requires a delivery attempt to that mailbox, which this tool never makes. Provider classifications are domain-level observations.
Why is the provider list limited?
A static list covers well known operators only. New disposable domains appear constantly, so an unlisted domain is unknown rather than safe.