Email Address Validator - Verify Syntax & Deliverability

Check whether an email address is valid and deliverable. We verify the RFC syntax, confirm the domain has live mail servers (MX records), and flag disposable or role-based addresses.

We never store the address you enter. Validation runs on demand only.

How Email Validation Works

Syntax checking

The first step confirms the address follows the format defined by email standards: a local part, an @ sign, and a domain. We use PHP's built-in RFC-aware validator to catch typos, illegal characters, and malformed domains before any network lookup.

MX record verification

A valid format does not mean the address can actually receive mail. We query the domain's DNS for MX (Mail Exchange) records, which name the servers responsible for accepting its email. If no MX records exist, we fall back to checking for an A/AAAA record, because some mail servers will deliver there as a last resort.

Disposable and role-based flags

  • Disposable: Throwaway providers (such as Mailinator) create addresses that expire quickly. They are valid but rarely worth adding to a mailing list.
  • Role-based: Shared mailboxes like info@ or support@ are read by teams, not individuals, and often bounce marketing email.

These are advisory warnings, not failures - the address may still be perfectly usable depending on your goal.

What this tool does not do

It does not connect to the mail server to confirm the specific mailbox exists (SMTP probing), because most providers block this and it can harm your sender reputation. A “Valid & Deliverable” result means the domain can receive mail, not that the exact inbox is active.

Frequently Asked Questions

It runs four checks. First, it verifies the address syntax using PHP's built-in RFC-aware validator (filter_var). Second, it looks up the domain's MX (mail exchange) DNS records to confirm the domain is configured to receive email, falling back to an A/AAAA record if no MX exists. Third, it flags whether the domain is a known disposable provider. Fourth, it flags whether the local part looks role-based, such as info@ or support@. It then combines these into an overall verdict of Valid & Deliverable, Valid with Warnings, or Invalid.

No. The tool does not connect to the mail server to probe whether the exact inbox is active (SMTP verification), because most providers block this and it can harm sender reputation. A Valid & Deliverable result means the domain publishes MX records and is configured to receive email, not that the specific address is a live, monitored mailbox.

A Warning means the address is syntactically valid but has a caveat. There are three reasons the tool issues a warning: the domain has no MX records but does have an A or AAAA record (mail may fall back to it, but delivery is not guaranteed), the domain is on the tool's list of known disposable or throwaway providers, or the local part matches a common role-based name like admin@, info@, or support@. These are advisory flags, not failures, and the address may still be usable depending on your goal.

Both checks use curated, conservative built-in lists, not a live external database. The disposable check compares the domain against a fixed list of twenty known throwaway providers such as mailinator.com, guerrillamail.com, and 10minutemail.com. The role-based check compares the local part against common shared-mailbox names such as admin, info, support, sales, and noreply. Because these lists are intentionally short, a disposable or role-based address that is not on the list will not be flagged.

No. The tool states that it never stores the address you enter, and validation runs on demand only when you submit the form. The only lookup the validation performs is a DNS query of the address's domain to read its MX and A/AAAA records; the address itself is not retained after the result is shown.

Frequently Asked Questions

What does the Email Address Validator actually check?
It runs four checks. First, it verifies the address syntax using PHP's built-in RFC-aware validator (filter_var). Second, it looks up the domain's MX (mail exchange) DNS records to confirm the domain is configured to receive email, falling back to an A/AAAA record if no MX exists. Third, it flags whether the domain is a known disposable provider. Fourth, it flags whether the local part looks role-based, such as info@ or support@. It then combines these into an overall verdict of Valid & Deliverable, Valid with Warnings, or Invalid.
Does this tool confirm that the specific mailbox exists?
No. The tool does not connect to the mail server to probe whether the exact inbox is active (SMTP verification), because most providers block this and it can harm sender reputation. A Valid & Deliverable result means the domain publishes MX records and is configured to receive email, not that the specific address is a live, monitored mailbox.
Why did I get a Warning instead of a Pass?
A Warning means the address is syntactically valid but has a caveat. There are three reasons the tool issues a warning: the domain has no MX records but does have an A or AAAA record (mail may fall back to it, but delivery is not guaranteed), the domain is on the tool's list of known disposable or throwaway providers, or the local part matches a common role-based name like admin@, info@, or support@. These are advisory flags, not failures, and the address may still be usable depending on your goal.
How does the tool detect disposable and role-based addresses?
Both checks use curated, conservative built-in lists, not a live external database. The disposable check compares the domain against a fixed list of twenty known throwaway providers such as mailinator.com, guerrillamail.com, and 10minutemail.com. The role-based check compares the local part against common shared-mailbox names such as admin, info, support, sales, and noreply. Because these lists are intentionally short, a disposable or role-based address that is not on the list will not be flagged.
Do you store or save the email addresses I enter?
No. The tool states that it never stores the address you enter, and validation runs on demand only when you submit the form. The only lookup the validation performs is a DNS query of the address's domain to read its MX and A/AAAA records; the address itself is not retained after the result is shown.
Last reviewed: Reviewed by the

How this tool works: This tool runs in your browser and on our server in real time. Depending on the tool, results are computed directly from the input you provide or retrieved from live, authoritative data sources at the moment you run a lookup. We do not sell your data, and your lookups are kept private — any history shown here is stored only on your device.

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