Gmail alias and dot checker
This Gmail alias checker shows the real inbox behind any Gmail address. Gmail ignores dots, drops everything after a plus sign and treats googlemail.com as gmail.com, so [email protected] and [email protected] are the same mailbox. Paste an address to see its one inbox and exactly what was removed. It also folds Outlook, iCloud, Proton and Yahoo aliases.
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This check runs in your browser. Nothing you type is sent to us or anyone else.
We don't store what you type. This tool runs in your browser and nothing is sent: the address never leaves your device.
One inbox, many addresses
Every line below is the same Gmail mailbox. A site that compares email addresses as plain text sees four new players; a site that folds the aliases first sees one person signing up four times.
[email protected] → [email protected]
[email protected] → [email protected]
[email protected] → [email protected]
[email protected] → [email protected]That is the trick behind much welcome-bonus abuse: one real inbox, so every confirmation email arrives, and an endless supply of addresses that look different. Plus tags are also used honestly, to filter mail, which is why the useful question is not "is this an alias?" but "has this inbox signed up here before?".
The rules this checker applies
- Gmail and googlemail.com: dots in the name are removed, everything from the first
+is removed, and googlemail.com becomes gmail.com. - Outlook, Hotmail, Live and MSN, iCloud (icloud.com, me.com, mac.com) and Proton (proton.me, protonmail.com, pm.me): everything from the first
+is removed. Dots are kept, because these providers treat them as part of the name. - Yahoo: the part after the last hyphen is removed, the form Yahoo uses for its extra addresses.
- Any other domain: the address is only lower-cased. Other mail servers set their own alias rules, and we don't guess them.
These are the same rules InlineShield applies to every sign-up it screens.
How to catch alias sign-ups automatically
InlineShield folds each sign-up's address to its inbox and compares it with the earlier sign-ups at your site. A sign-up from an inbox that is already registered is held for review, and so is a plus-tagged address, so you can approve the player without the bonus or ask for KYC. It runs before the account exists, through one call from your registration code: see the REST API and Gmail alias detection.
Frequently asked questions
Does Gmail ignore dots?
Yes. Gmail ignores dots in the part before the @, so [email protected], [email protected] and [email protected] all reach the same inbox.
What is a Gmail plus alias?
Anything you add after a +: mail to [email protected] or [email protected] is delivered to [email protected]. You don't have to set it up; every Gmail address accepts it.
Is googlemail.com the same as gmail.com?
Yes. They are two names for the same mailbox, so [email protected] is [email protected].
Why do bonus abusers use Gmail aliases?
Each variation looks like a new address to a site that compares addresses as text, yet every confirmation email lands in one inbox. One person can claim a welcome bonus again and again without opening new mailboxes.
Are aliases always a sign of fraud?
No. Many people use plus tags to sort their mail. What matters is whether the same inbox has already signed up at your site, which is what InlineShield checks.
Does it work for Outlook, Yahoo, iCloud and Proton?
Yes. For Outlook, Hotmail, Live, iCloud and Proton the checker removes the +tag; for Yahoo it removes the part after the last hyphen. Dots are kept for these providers, because they don't ignore them.
What about other domains?
The address is only lower-cased. A company or personal mail server can have its own alias rules, and we don't guess them.
Are Gmail addresses case-sensitive?
No. [email protected] and [email protected] are the same inbox, so the checker lower-cases everything.
Is my address sent anywhere?
No. This checker runs entirely in your browser and makes no network request: nothing is sent to us or anyone else, and nothing is stored.
Can a player get around this with a second Gmail account?
Yes: a second Gmail account is a different inbox. That is why InlineShield also checks for temp mail, machine-made names, bots and VPN or datacenter IPs at sign-up.
How do I check this at sign-up?
Use the REST API or the WordPress plugin. InlineShield folds the alias, compares the inbox with your earlier sign-ups and tells you to allow, hold for review or ask for KYC before the bonus is paid.
Stop one inbox from claiming the bonus twice
The Free plan includes 1,000 screenings a month. Create an account, add your keys and see real verdicts on your own traffic. No card, no sales call, no setup fee.