Skip to content
MailCull
Sign in Start for free Dashboard
Single check · free

One address, the whole story.

Paste an email and watch the check run, signal by signal. Try it right here. The quick check is free, no account needed. The deep scan, with the mailbox probe, is free in the app.

Run a deep scan free Quick vs deep ↓
500 free checks a month No credit card
Verify an email Quick check · live
Address shape·
Typo check·
MX records·
Disposable provider·
Role address·
The quick check reads five signals and never touches the mailbox. The deep scan, with the full mailbox probe, is free in the app.
01Two depths

A quick look, or the full probe.

Both cost one credit. The quick check answers in about a second; the deep scan asks the mailbox’s own server and waits for a straight answer.

Quick check ~1 second
ShapeIs it a valid address at all, before anything else runs.
TypoCatches gmaill.com and friends, one letter off a real provider.
MX recordsDoes any server actually receive mail for the domain.
DisposableKnown throwaway providers, flagged from a live list.
RoleShared inboxes like info@ and sales@: deliverable, but often unread.
Never touches the mailbox. Safe to run on anything, even from the free tools.
Deep scan The mailbox probe
SMTP handshakeWe ask the server, mailbox by mailbox, and record its reply word for word.
Mailbox existsNot “the domain works.” This address, this inbox, accepts mail.
Catch-allDomains that accept everything get marked risky, and the receipt says why.
Greylist retryIf the server stalls, we come back later instead of guessing.
Tenant probeFor Microsoft 365 domains, a tenant-level check often gets a real answer anyway.
Included on the free plan. Same engine as Pro, not a crippled demo.
02The receipt

Every verdict ships with its receipt.

Most verifiers hand you a label and ask you to trust it. We show you the mail server’s actual reply, so you can audit any verdict yourself.

SMTP check · example 
$ mailcull check [email protected]
resolve mx  aspmx.l.google.example
connect    220 mx.google ESMTP ready
> MAIL FROM <[email protected]>
> RCPT TO <[email protected]>
250 2.1.5 OK · mailbox exists
Deliverable Real mailbox, accepts mail. Safe to send.
№ II The receipt

Stop guessing about that one address. Ask the server.

The deep scan is free in the app: 500 checks a month, mailbox probe included, receipt attached to every verdict.

Run a deep scan free or try the quick check above ↑

Common questions

How do I verify an email address?

Paste it and MailCull runs the checks live: syntax, MX, disposable and role patterns, and a real SMTP probe of the mailbox. You get one of four verdicts (deliverable, risky, undeliverable, unknown) plus the receipt: the server’s actual reply and the MX record behind it.

Can you verify an email without sending one?

Yes. The SMTP probe asks the receiving server whether the mailbox exists without delivering a message, so nothing lands in the inbox.

Is it free?

The quick check is free with no account. The deep scan, with the live mailbox probe, is free in the app on the free plan (500 verifications a month).

How accurate is it?

Around 91 to 93 percent on real-world lists. Catch-all domains and greylisting return unknown rather than a false yes, so you are never given confidence the data does not support.

Free tools

Read more