Upload or paste a list of email addresses. Validates format, checks MX records, and shows provider breakdown (Gmail, Yahoo, Outlook, and more) with downloadable CSV results.
A Bulk Email MX Checker is a tool that validates email addresses at scale — checking both the format and whether the domain has working mail exchange (MX) DNS records. Instead of checking one email at a time, you can paste or upload hundreds of addresses and get instant results for every one of them.
A syntactically valid email address like user@example.com may still be undeliverable if the domain has no MX record set up. Checking MX records lets you identify undeliverable addresses before sending, reducing bounce rates and protecting your sender reputation.
Our tool automatically classifies each email's domain by its mail provider based on the MX record exchange hostname. This lets you instantly see what percentage of your list uses Gmail, Yahoo Mail, Microsoft Outlook/Exchange, ProtonMail, Zoho, and others — critical insight for deliverability and campaign planning.
.csv or .txt file.Is this tool free?
Yes — completely free, no sign-up required, up to 500 emails per request.
Does it verify that the mailbox actually exists?
No — MX checking confirms the domain can receive email but does not perform SMTP RCPT TO verification (which most mail servers block). It catches invalid domains and missing MX records.
What file formats can I upload?
Any .txt or .csv file with one email per line. We automatically parse comma-separated, semicolon-separated, and newline-separated lists.
How fast is it?
We run all DNS lookups in parallel — a list of 500 emails typically completes in under 10 seconds.