The Gmail Dot Trick and Plus Addressing: What They Do and Don't Do

Gmail gives every account two address features that most people discover by accident. Plus addressing means you can add a plus sign and any word after your username, so ash+receipts@gmail.com is delivered to ash@gmail.com, with the tag still visible so you can filter on it. The dot trick means Gmail ignores full stops in the username, so a.sh@gmail.com, as.h@gmail.com and ash@gmail.com are the same inbox and always were. Both are genuinely useful for organising mail that arrives at one account and for working out which signup handed your address to someone else. What neither of them does is hide you. A tagged or dotted address contains your real address in plain text, and turning it back into the original takes one step that list brokers and signup systems perform routinely. They are labels on your inbox, not a different identity, and they do not create separate accounts. This guide explains how each one works, how to use them well, and exactly where they stop.

What is plus addressing in Gmail?

Plus addressing is Gmail’s way of letting one account answer to an unlimited number of addresses. Take your username, add a plus sign, add any word or phrase you like, and the result is a working address that delivers to your normal inbox. ash+bank@gmail.com, ash+newsletters@gmail.com and ash+that-conference-2026@gmail.com all arrive at ash@gmail.com. You do not have to set anything up in advance, and there is no limit on how many tags you use.

The tag survives delivery. When the message lands, the address in the To line still reads ash+bank@gmail.com, which is the entire point: Gmail can filter, label, archive or forward based on it, and you can see at a glance which tag a sender used. The tag does not change who you are to Gmail. It is extra information carried along with the address, ignored for the purpose of finding your mailbox and preserved for everything else.

What does a plus sign in an email address mean?

Nothing to the email standard itself. Sub-addressing, the general idea of appending a tag to a mailbox name, is a convention that individual providers implement, and the separator is their choice. Gmail, Microsoft, Fastmail and Proton chose the plus sign. Yahoo chose a hyphen for its version. When you see someone+word@ in the wild, it almost always means the recipient is using one of those providers and has tagged the address for their own filing.

What is the Gmail dot trick?

Gmail does not treat a full stop as a character in a username. If your address is ashketchum@gmail.com, then ash.ketchum@gmail.com, a.s.h.ketchum@gmail.com and ashketchum@gmail.com are all the same account, and mail sent to any of them arrives in your inbox. The same is true of capitalisation, and @googlemail.com is interchangeable with @gmail.com. You did not create these variants and you cannot remove them; they exist because of how Gmail resolves addresses, not because of anything in your settings.

Case is the one of those three that is not a Gmail policy at all. Almost every mail server on the internet folds capitalisation when it works out which mailbox an address belongs to, for reasons that have nothing to do with Google, and the standard has a good deal to say about it.

This applies to consumer @gmail.com accounts. Google Workspace addresses at a company’s own domain treat dots as part of the address, so a.sh@yourcompany.com and ash@yourcompany.com can be two different people there.

Two consequences follow. The first is that any dotted spelling of your address that someone else types, by mistake or on purpose, reaches you, which is why Gmail users occasionally receive mail clearly meant for a person with a similar name. The second is the one this guide exists to state plainly: dot variants do not create separate accounts. They are the same account with the same inbox, the same login and the same identity, wearing a different spelling. Any service that needs to tell people apart knows this and collapses the variants back to one address before it looks at them. Treat the dot trick as a way to label mail arriving at your own inbox, and nothing more ambitious than that.

How do you use a plus address at signup?

The useful habit is one tag per relationship. When a site asks for your address, give it ash+thatsite@gmail.com instead of ash@gmail.com, using the name of the site or company as the tag. Nothing else changes; the confirmation mail arrives in your inbox as usual.

Then let Gmail do the filing. Open Gmail’s search options, put the tagged address in the To field, and create a filter from it. You can apply a label so that everything from that relationship is grouped, skip the inbox so it never interrupts you, or forward it somewhere else. Once the filter exists it applies to every future message sent to that tag, and you can adjust or delete it at any time without touching the account.

The second benefit is the one people value most. Because you gave each sender a different tag, the tag on an unexpected message tells you where the address came from. If mail from a company you have never dealt with arrives addressed to ash+thatsite@gmail.com, then that site shared, sold or lost your address, and you know it without guessing. At that point a single filter sending everything addressed to that tag to the bin closes the door, while your real address and every other tag carry on as before.

Keep tags simple: the site’s own name is best, because you will need to recognise it months later. Which brings us to the two things a tag will not do.

Do the dot trick and plus addressing hide your real address?

No, and it is worth seeing exactly why, because the reversal is so short.

Take a tagged address: ash+thatsite@gmail.com. Delete everything from the plus sign up to, but not including, the @. You now have ash@gmail.com. That is the whole procedure. It works on every plus address from every provider, it can be done by hand, and it is done automatically by the address-normalisation libraries that most signup systems, marketing platforms and list brokers run before storing an address. A tag is not a disguise. It is your real address with a note attached, and anyone who wants the address without the note can have it in one step.

Now take a dotted address: a.s.h@gmail.com. Remove the dots. You have ash@gmail.com. Again one step, again routinely automated, and in this case there was never a separate identity to begin with, only a spelling.

Three practical effects follow. Your tag may not survive into the recipient’s database at all, because many systems strip it on entry, in which case later mail arrives addressed to the plain form and the tag tells you nothing. When it does survive, it is visible to the recipient and says something about you: what you called them and when. And in a data breach the dumped record contains your real address either way, because it was always right there.

So the honest description is this. Plus tags and dot variants are a labelling system for mail that reaches your real inbox. They help you sort it and trace it. They do not prevent your real address from being known, stored, shared or leaked, because they are your real address.

Why do some websites reject an email address with a plus sign?

Because the plus sign is legal in an address but inconvenient in software, and inconvenience wins more often than it should.

The most common cause is a validation rule that was never right. A great many signup forms check addresses with a pattern copied from an old tutorial, and a great many of those patterns simply left the plus sign out of the list of allowed characters. The address is valid, the form says it is not, and the person filling it in has no way to know why.

The second cause is deliberate. Some services reject plus addresses on purpose, on the theory that a tagged address is more likely to belong to someone who signs up more than once. That is a policy decision by the site, not a technical limit, and there is nothing to do about it except use a different address.

The third cause is the interesting one for developers, because it produces a signup that succeeds and a confirmation link that fails. In the encoding web forms use for query strings, a plus sign stands for a space. If a site builds its verification link by dropping the address into the URL without encoding it, ash+thatsite@gmail.com arrives at the server as ash thatsite@gmail.com, the lookup fails, and the user sees a message saying the link is invalid. The fix on the site’s side is to encode the plus as %2B. The symptom on the user’s side is a tag that worked at signup and broke at the very next step.

The fourth cause is downstream. The signup form may accept the address perfectly, and then a customer-relationship system, a marketing platform or a support tool it feeds into may mangle or reject the tag. You will find out when a message you were expecting never arrives.

If a form rejects your tag, or accepts it and the confirmation never comes, retry without it. A tag is an organising convenience, and the moment it costs you access to something it has stopped being one.

Do other providers support plus addressing?

Most of the major ones do, with differences that matter. The table reflects each provider’s documentation as of September 2026; these rules change, so test with a single message before depending on one.

Does Outlook support plus addressing?

Yes, on both the free Outlook.com service and on work and school accounts hosted in Microsoft 365. Microsoft turned plus addressing on for all Microsoft 365 organisations in 2022, having first offered it as an opt-in feature in 2020 because a small number of existing addresses already contained plus signs and would have been misread. An organisation’s administrator can still disable it. So if a tagged address bounces at a company or university, the most likely explanation is a deliberate setting on their side, not a limitation of your account.

When is a separate address the better answer?

Use a plus tag when the address is allowed to be yours and you simply want the mail filed. Receipts, newsletters you actually read, accounts you will keep for years, anything where the sender knowing your real address is fine: tag it, filter it, and enjoy an inbox that sorts itself. A dedicated alias service does the same job with more control and a monthly fee, and the trade-offs between an alias and a throwaway address run deeper than a tag can reach.

Use a separate address when the point is that the recipient should not have your real one. The tag fails that test by construction, because it carries the real address inside it, and it fails it twice over on any site that strips tags, rejects them, or leaks its database. For a signup you do not trust, a service you are trying once, or anything you would rather not see in a breach dump next to your name, the only thing that keeps your address out of their records is an address that was never yours.

Where a tagged Gmail address still contains your real one, a Pokemail inbox does not: the local part is generated at random, so there is nothing in it to strip back to. That is the whole difference, and it is the test to apply: if you do not mind the other side knowing where the mail really goes, tag it; if you do, give them an address that was never yours.