Gmail Dot & Plus Addressing Guide: How Gmail Aliases Work

Gmail includes two built-in addressing rules that let a single Gmail account receive mail at hundreds of different-looking address variations without changing any settings. Understanding how those rules work—and when they expose your real address—helps you choose between a Gmail alias and a separate disposable inbox.

Four Official Gmail Addressing Rules

Before routing an incoming message, Gmail normalizes the local-part (everything before @):

• Dots are ignored: [email protected], [email protected], and [email protected] all deliver to the exact same Gmail inbox.
• Plus tags (`+tag`) are ignored for routing: [email protected] and [email protected] arrive in [email protected], while preserving the +news tag in the To: header so you can filter messages automatically.
• `gmail.com` and `googlemail.com` share the same inbox: Mail sent to either domain reaches the same account.
• Letter case is ignored: [email protected] and [email protected] are identical.

How Many Dot Variations Exist?

Between each pair of characters in an n-letter username, there are n - 1 positions that may either contain a dot or not, yielding 2^(n - 1) dot combinations. Adding custom +tag suffixes multiplies that set further.

What Gmail Aliases Are Good For

• Automatic Inbox Filtering: Create a Gmail filter matching to:([email protected]) to apply labels or skip the inbox automatically.
• Identifying Leaked Signups: If you register on a store using [email protected] and unrelated spam later arrives at that exact tag, you know where the address leaked.
• Quick QA Testing: Developers testing their own forms can route multiple test accounts into one personal inbox.

Where Gmail Aliases Do Not Protect You

• Zero Anonymity: Anyone—and any automated script—can strip dots and remove +tag suffixes in a millisecond to reveal your real Gmail address (see how in our Gmail Address Normalizer guide).
• Cannot Be Turned Off Completely: If spammers email your base address after stripping the +tag, your main inbox receives the spam forever.
• Google Workspace Exceptions: On custom company or school Google Workspace domains, [email protected] and [email protected] are distinct mailboxes—the dot rule applies only to @gmail.com and @googlemail.com.

When you do not want a website to learn your real Gmail address at all, generate an independent temporary inbox on Email Generator instead, or compare rules across other providers in Plus and Dot Tricks Beyond Gmail.