Syntax passes fakes
[email protected] is perfectly formed and may still not exist.
Mailcleaner · The checks
Email verification checks: syntax, MX, SMTP and more.
Each address runs through a sequence of checks, from a free syntax test to a live question to the mail server, and the first one that gives a definite answer sets the verdict. A confidence score is built from every signal along the way.
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mailcleaner.flaxxa.com / engine
Verify
VALID[email protected]google
Risk
8
Confidence
96
Signals
- MX found
- SMTP connectable
- Disposable
- Role-based
- Cheapest check first
- Layered
- No message sent
- SMTP
- Tested, not guessed
- Catch-all
- For greylisted servers
- Retries
01 / 04
Why does one check not prove an address is real?
MX passes dead mailboxes
A domain can receive mail while the particular person left years ago.
Some servers say yes to everything
Catch-all domains accept any address, so a naive check calls them all valid.
02 / 04
Which checks does Flaxxa Mailcleaner run, and in what order?
Syntax and typos
The format check runs first, with a look-alike check for big providers (gmial.com, outloook.com).
Suppressions, disposable and role
Addresses on your suppression list stop here; known throwaway domains and shared addresses such as info@ are flagged.
Mail servers and mailbox
An MX lookup finds the mail server, then an SMTP check asks whether the mailbox exists, and a test address reveals catch-all domains.
Deeper signals and score
Deep checks add spam-trap patterns and a domain blocklist lookup; every signal feeds the confidence score.
03 / 04
What does each check catch?
Syntax
Malformed addresses come back invalid with the reason syntax_error.
Typo detection
Look-alikes of major providers, with the corrected address suggested or fixed for you.
Disposable
Known throwaway domains, from a list refreshed weekly from public sources.
Role
Shared addresses such as info@, sales@, support@ and noreply@.
MX lookup
No mail server means the address is invalid (mx_missing).
SMTP check
Accepted, rejected or full mailbox, from the server's own answer.
Catch-all
A test address that can't exist shows whether the domain accepts everything.
Microsoft and Yahoo probes
Extra existence checks for these providers where enabled.
04 / 04
What do you gain from layered checks?
Better answers, and honest ones.
Fewer false passes
Each layer catches what the others miss.
No blind guesses
Catch-all and unreachable servers are labelled as such.
Cheap where it can be
Obvious problems stop before the slower checks run.
Keep exploring
More Mailcleaner capabilities
Email verification
Verify one email address or a whole list: a verdict, a 0–100 risk score and a confidence score for each, from a paste, a file, Google Drive or the API.
Catch-all detection
Find catch-all (accept-all) domains in your email list. Flaxxa Mailcleaner tests each server, scores catch-all domains and never passes them off as valid.
Disposable email checker
Check whether an email address uses a disposable (temporary) inbox, in a list or on your sign-up form, plus role addresses like info@ and sales@.
FAQ
The checks: common questions
Yes, on Standard checks and above. It connects to the domain's mail server from Flaxxa's servers, names the recipient, and disconnects before any message is sent. Some providers block these checks or accept every address; those results are marked risky or catch-all rather than valid.
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