Plus Addressing and Subaddressing: How the Plus-Sign Email Trick Works

You have probably seen an email address with a plus sign buried in it, like [email protected], and wondered whether someone made a typo. They did not. That plus sign is a feature called plus addressing, also known as subaddressing, and it lets you spin up endless variations of your address without opening a single new account. Here is how it works, what it is good for, and which providers support it.

What is plus addressing (and subaddressing)?

Plus addressing and subaddressing are two names for the same feature: you append a + sign followed by a tag to the local part of your address, and mail still lands in your main inbox. The core address stays the same, and the tag is just a label you pick. So can you put a plus in an email address? Yes. From [email protected] you can hand out [email protected] or [email protected], and every message arrives back in [email protected]. Plenty of providers support it, Gmail, Yahoo, and Microsoft Outlook among them.

How plus addressing works

The mechanics are simple:

1. Start with a valid address, like [email protected].
2. Pick a purpose, such as a newsletter signup or an online store.
3. Add a plus sign and a tag right after the name and before the @, so [email protected].
4. Use that tagged address when you sign up for the service.
5. Your provider reads the base address, ignores the tag, and delivers to your main inbox.
6. You set up a filter or rule that sorts the mail by its tag.

So what does adding +1 to an email address do? The +1, or any tag you choose, creates a fresh variation that still reaches you. It does not build a new mailbox. In technical terms the syntax is local-part+tag@domain, and the tag can be almost anything as long as it follows normal address rules, so no spaces. One detail worth knowing: these are receive-only addresses. You can collect mail at [email protected], but you cannot send from it.

What you can use plus addressing for

There are three practical reasons to reach for a plus tag. The first is organizing: because every tag is searchable, you can route jane+newsletters into one folder and jane+shopping into another, which keeps a busy inbox tidy. The second is tracking the source: give a different tag to each company, and if jane+store suddenly starts getting spam, you know exactly who leaked or sold your address. Businesses already split mail this way with role-based addresses like support@ and sales@, and a plus tag gives an individual the same control. The third use is disposable signups: a tag makes a quick throwaway address for a one-time download or trial, and you can filter or bin anything sent to it later. With around 162 billion spam emails sent every day, that kind of filtering earns its keep.

Which email providers support plus addressing

Gmail

Gmail has supported the plus trick since 2008. Append a + and any mix of words or numbers after your username, and Google treats it as the same account, delivering everything to your primary inbox.

Outlook.com and Microsoft Exchange

Outlook.com offers the same feature, and in Exchange Online plus addressing is turned on by default. When Exchange receives mail for a tagged address, it first tries to match the full address, then falls back to the base address without the plus sign and tag.

Yahoo Mail

Yahoo supports the idea through its own disposable email address feature. You create temporary addresses tied to your main account and delete them later if they start attracting junk.

Plus addressing vs aliases and disposable emails

It helps to see where plus addressing sits next to two similar ideas. An email alias is a separate address that forwards to your inbox, but it usually needs extra setup, whereas a plus tag works on the fly with no configuration. A true disposable email address is a temporary mailbox made for short-term use, often to avoid handing over a real address at all. The big difference is that plus addressing is tied to your real, long-term account, so it is not anonymous. Anyone who notices the pattern can strip the tag and reach your base address, which makes it great for sorting mail but weak as a privacy shield. One more quirk: when you reply to a message sent to a tagged address, the reply normally goes out from your primary address, not the plus version.

The catch for senders and marketers

If you send email rather than receive it, plus addressing cuts the other way. The same person can sign up as [email protected], [email protected], and a dozen more, and your list will read them as separate subscribers even though they all reach one inbox. That inflates your subscriber count, wastes sends, and can quietly drag down your engagement metrics. Good email verification spots these tagged variations and flags them as duplicates of the same real mailbox, so running email verification before you import a list keeps your numbers honest and your sending lean.

Getting more out of your inbox with a plus sign

Plus addressing is one of the easiest email tricks to start using, and it costs nothing. Add a tag, set a filter, and you get a tidier inbox along with a quiet way to see who shares your address. Just keep its limits in mind: it is receive-only, it does not hide your real address, and a few signup forms still refuse the plus sign. Used with those caveats, the humble plus sign turns a single inbox into as many labelled channels as you need.