Comparison
Plus aliases vs dot aliases: two Gmail tricks, different strengths.
Gmail supports two kinds of address variation out of the box. The dot trick rearranges periods in your username. The plus trick appends a tag after a + sign. Each has trade-offs worth understanding before you commit to a workflow.
How the dot trick works
Gmail ignores every period in the local part of your address. janedoe@gmail.com, jane.doe@gmail.com, j.a.n.e.d.o.e@gmail.com, and ja.ned.oe@gmail.com all deliver to the exact same inbox. Google has confirmed this behavior in its official documentation. The dots exist only in the visible address string; on the server side, they are stripped before routing.
The number of possible dot variations depends on the length of your username. For a seven-character local part, there are 64 unique dot placements (2 to the power of the number of possible dot positions). Longer usernames generate exponentially more variations.
How the plus trick works
Appending +anything before the @ sign creates a plus alias. For example, janedoe+shopping@gmail.com and janedoe+work@gmail.com both land in the janedoe@gmail.com inbox. The tag after the plus sign can be any string of letters, numbers, dots, and hyphens. There is no limit on how many plus aliases you can create.
Side-by-side comparison
| Feature | Dot Alias | Plus Alias |
|---|---|---|
| Syntax | Insert or remove dots: j.ane.doe@gmail.com | Append a tag: janedoe+tag@gmail.com |
| Number of variations | Finite; depends on username length | Unlimited; any string after the + |
| Accepted by sign-up forms | Almost universally accepted | Sometimes rejected; some forms block the + character |
| Readability | Looks like a normal email address | Clearly shows a tag, which some recipients find unusual |
| Filterable in Gmail | Yes, using the "To" field in filters | Yes, using the "To" field in filters |
| Root address discoverability | Harder to reverse; many dot placements exist | Easy; strip everything after + |
| Human memorability | Moderate; easy to forget exact dot placement | High; the tag is descriptive and self-documenting |
| Google Workspace support | Not supported; dots create separate users in Workspace | Supported in most Workspace configurations |
When to use dot aliases
Dot aliases excel when a website rejects the + character in email fields. Because the dots look like a normal email address, they pass virtually every validation check. They are also useful when you want a subtle alias that does not reveal its purpose to the recipient. A store seeing jane.doe@gmail.com has no obvious indicator that you are using a tracking alias, unlike janedoe+storename@gmail.com.
Dot variations are also helpful for A/B testing sign-ups. You can use one dot placement for source A and another for source B, then compare which sends more email over time.
When to use plus aliases
Plus aliases are ideal when you need descriptive, self-documenting tags. Seeing +amazon or +newsletter in a filter instantly tells you the purpose. Because the number of plus aliases is unlimited, they scale to hundreds of services without running out of unique addresses.
They are also the better choice for leak detection. If spam arrives at janedoe+specificservice@gmail.com, you know immediately which company sold or leaked your information. Dot aliases can serve this purpose too, but tracking which dot placement you gave to which service is harder to manage at scale.
Combining both tricks
Dot aliases and plus aliases are not mutually exclusive. You can use them together for layered organization. For example, reserve a dot variant like j.anedoe@gmail.com as your "public" address and attach plus tags to it: j.anedoe+shopping@gmail.com, j.anedoe+trials@gmail.com. This gives you a broad category (dot variant) plus a specific purpose (plus tag) in every alias.
In Gmail filters, you can match on the full combined address, the dot variant alone, or just the plus tag, giving you three levels of filtering granularity from a single address.
Common pitfalls
- Workspace users: Google Workspace treats dots as significant.
jane.doe@company.comandjanedoe@company.commay be different users. The dot trick only works with personal@gmail.comaccounts. - Form validation: Some websites strip plus tags silently, meaning your emails arrive but the tag is lost. Always verify the alias actually works by checking for a confirmation email addressed to the full alias.
- Overcomplication: Using too many dot variants without a tracking system leads to confusion. Stick to a naming convention and document your aliases if you create more than a handful.