Email Checker
Check one email address or a list of up to 1,000 for syntax errors, domain typos, disposable services, role inboxes and whether the domain can receive mail, then download the results as a CSV.
Checks run on our server, so what you enter is sent thereFree trial: 1 run of Email Checker every day. After that, 2 credits per run.
Find the addresses that will bounce, or waste a send, before they reach your list
Type one address or paste a whole list. Each address is checked against the syntax rules mail servers apply, compared with well-known providers to catch slips such as gmial.com, matched against a public list of disposable inbox services, and its domain is looked up in DNS to see whether it can receive mail at all.
Every result comes with the reason in plain words, and a list can be downloaded as a CSV with your original columns kept and the status added at the end.
Why checks stop short of the mailbox, and what each result proves: B2B sales email verification techniques.
What Email Checker gives you
Reads DNS the way mail servers do
A domain with MX records, or with only an address record (the fallback the SMTP standard allows), counts as able to receive mail. A domain that does not exist, or that publishes a null MX saying it takes no mail, is marked invalid.
Typo suggestions you approve
A domain one or two letters away from a major provider gets a suggestion and a button to use it. Nothing is changed unless you click, and real regional domains are left alone.
Risk flags with reasons
Disposable services, role inboxes such as sales@ or info@, and free providers are flagged separately, so you decide what each one means for your campaign.
Lists and CSV files
Paste text in any shape or choose a CSV: addresses are found, duplicates removed, and up to 1,000 are checked with progress shown. Filter by status and copy the valid ones in one go.
How to use Email Checker
Choose one address or a list
Type an address, or switch to the list tab and paste text or choose a CSV file.
Run the check
Results appear with a status of valid, risky, invalid or unknown and the reason for it.
Fix, filter and export
Accept typo suggestions, filter by status, then download the CSV or copy the valid addresses.
Other names for this tool
People also look for this as email verifier, email address validator, bulk email verification, disposable email checker and email list cleaner. It is the same tool on this page.
Limitations
- It does not connect to the recipient’s mail server, so it cannot confirm that one particular mailbox exists or detect catch-all domains.
- Up to 1,000 addresses per list, and 2,000 addresses an hour from one network.
Questions about Email Checker
Does it email the address?
No. It reads public DNS records for the domain and compares the address with its lists. Nothing is sent to the address and the recipient cannot see the check.
Are the addresses stored?
No. They are checked in memory on our server to query DNS and are not logged or saved. CSV files are read in your browser; only the addresses are sent.
Can this confirm that a mailbox exists?
No, and it does not pretend to. Confirming one mailbox means connecting to the recipient’s mail server, which many servers answer vaguely or treat as abuse. This tool proves the address is well formed and that its domain can receive mail.
What makes an address risky rather than invalid?
Risky addresses can receive mail but are poor targets: a likely typo, a disposable inbox that is abandoned within days, or a shared role inbox that several people read. Invalid addresses cannot receive mail at all.
Why does a domain with no MX record still count as valid?
The SMTP standard, RFC 5321, tells senders to fall back to the domain’s own address record when there is no MX. Such domains can receive mail, so they are marked valid with a note rather than rejected.
What does unknown mean?
The DNS lookup timed out or failed, which is usually temporary. Nothing is concluded about the address; run the check again later before removing it from a list.
Are the addresses I check stored?
No. Addresses are sent to our server only to query public DNS and compare them with the lists, and they are not logged or saved. A CSV file is read in your browser, and only the addresses leave it.
Is a Gmail or Outlook address fine for B2B outreach?
It can receive mail, but it is flagged as a free provider because the owner may be a sole trader. Under UK rules a sole trader is treated as an individual, so marketing email needs consent.
Where does the disposable list come from?
From the community-maintained disposable-email-domains project, released into the public domain. The copy used here is pinned to a dated version; subdomains of a listed domain are caught too.