Fundamentals
Gmail plus-addressing: the complete guide to +alias filters
How Gmail plus-addressing works, how to build filters around it, and the limitations you should know before relying on it.
Published September 11, 2026 · Updated September 28, 2026 · 6 min read
Gmail plus-addressing lets you create unlimited variations of your address using a plus sign, without any setup. It is one of the simplest ways to organize mail and detect who is sharing your address. It also has real limits that are worth understanding before you build a system on top of it.
The syntax
Any Gmail or Google Workspace address accepts text after a plus. For example, if your address is sam@gmail.com, then sam+travel@gmail.com, sam+amazon@gmail.com, and sam+anything@gmail.com all deliver to sam@gmail.com. The plus tag is essentially free metadata attached to the message.
Setting up filters
- Open Gmail settings and go to Filters and Blocked Addresses.
- Choose Create a new filter and enter your tagged address in the To field.
- Click Create filter, then choose actions: apply a label, and optionally skip the inbox or mark as read.
- Repeat for each tag you use regularly.
For high-volume categories, skipping the inbox and applying a label keeps your main view clean. For important categories such as receipts, keep them in the inbox and label them so you can find them later.
Why it is useful
- No setup: tags work immediately and you can invent new ones on the spot.
- Traceability: if a tag starts receiving spam, you know which sender had it.
- Organization: labels turn one inbox into many virtual inboxes.
- Free: it is a built-in feature, not a paid add-on.
The limitations
Plus-addressing is not anonymity. The base address is visible to anyone who looks, and stripping the tag is trivial. Some websites reject addresses containing a plus sign during validation, and a few sign-up systems treat the tagged and untagged addresses as the same account.
Security considerations
Because your real address is embedded in every alias, a data breach reveals it. If that matters, use a disposable address on a service domain instead. For day-to-day organization, however, plus-addressing is excellent.
When to use something else
Reach for a temporary inbox for one-off sign-ups and a custom-domain disposable address when you want privacy plus durability. Use plus-addressing for the mail you actually intend to keep and organize.