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Definition
💡 Email alias: An alternate email address that funnels messages into your main inbox without needing a separate account. Think of it like having multiple front doors to the same house.
TL;DR: Email aliases let you use different addresses for different purposes (shopping, newsletters, work contacts) while managing everything from one inbox. No extra passwords, no switching accounts.
What does an email alias do?
You know that moment when you're signing up for something sketchy and wish you had a throwaway address? That's where aliases come in useful.
They give you compartmentalized addresses without the hassle of managing multiple email accounts. Use one alias for online shopping, another for newsletters, maybe one for job applications. All the mail lands in your main inbox, but you can track exactly where it came from. And if one alias starts getting hammered with spam? Kill it. Your main address stays clean.
The other big win is professional flexibility. Maybe you run a small business and want separate addresses for sales, support, and billing. With aliases, you don't need three separate accounts or email clients. Set up the aliases, create filters to auto-label incoming mail, and boom. You look like a legit operation with a proper team structure.
Using aliases for different contexts reduces your exposure when one email gets compromised.
Types of email aliases
Plus addressing (also called subaddressing) is the quick-and-dirty method. Just add a plus sign and any text before the @ symbol: yourname+shopping@gmail.com or yourname+newsletters@gmail.com. Gmail and most modern providers support this natively. Zero setup is required.
The catch? It's super obvious. Anyone can see your real address, and some forms reject the plus sign as invalid.
True aliases are completely separate addresses that look totally different from your main one. Like sales@yourdomain.com and support@yourdomain.com both routing to you@yourdomain.com. These require your email service provider to support alias creation (most do), and sometimes cost extra if you're using a custom domain.
Catch-all addresses are email settings that capture everything sent to your domain, even if the specific address doesn't exist. Set one up, and an email to randomstring@yourdomain.com will land in your inbox—even though you never created that address.
This is useful for tracking who leaks or sells your data. Give amazon@yourdomain.com to Amazon, linkedin@yourdomain.com to LinkedIn, and so on. If spam starts hitting one of those addresses, you'll know exactly who shared it.
The downside? You'll also catch spam meant for nonexistent addresses. Spammers blast emails at common addresses like info@yourdomain.com or admin@yourdomain.com, and with a catch-all enabled, all of it could reach you instead of bouncing.
How to create an alias email
Creating aliases depends on your provider, but the concept stays consistent across platforms.
In Gmail:
For regular accounts
- Gmail doesn't technically do "aliases," but plus addressing works automatically
- Just use yourname+anything@gmail.com when signing up for newsletters and other things
- All mail arrives at yourname@gmail.com
- Create filters (Settings > Filters and Blocked Addresses) to auto-label messages sent to specific aliases
For workspace accounts
For Workspace accounts, admins can create up to 30 aliases for each user at no extra cost. If you need more aliases, you must create another Google Account and add aliases to it.
If you own a domain through Google Workspace, go to Admin console > Users > select user > User information > Email aliases to add proper aliases. Note that this setting is available for admins only.
Users can click "Gear" icon > See all settings > Accounts > > Send mail as > Add another email address. The admin’s approval may be required.
In Outlook:
There are two methods you can choose to do this:
- Click "Account Manager" on the right of the Gear icon > My Microsoft Account.
- Your info > Account info > Edit Account info.
- Account username > Add email.
or
- Hit the settings gear > Go to Settings > Mail > Forwarding and IMAP > Email aliases > Manage or choose a primary alias.
Note: Microsoft does not recommend using an alias as a primary username, as it may interfere with the Outlook sign-in process.
In Spark on macOS:
Spark supports aliases for Gmail, iCloud, Outlook, Microsoft 365, and Yahoo email accounts. You can add as many aliases as you like.
You can find out how to do this on the various platforms here: https://sparkmailapp.com/help/sending-emails/set-up-an-email-alias
Best practices
Use descriptive identifiers. When you're setting up aliases with plus addressing, make them memorable. yourname+amazon@gmail.com is way more useful than yourname+s7x2@gmail.com when you're hunting down which service leaked your address.
Don't reuse aliases across contexts. If you burn an alias because it's getting spam, don't recycle it for something else. You'll just confuse your own filtering system.
Document your aliases. Keep a simple spreadsheet or note with which alias you used where. Future you will be grateful when trying to update a newsletter subscription six months from now.
Consider privacy implications. Plus addressing exposes your main address to anyone paying attention. If privacy matters for that context, use a proper alias or disposable email address instead.
Monitor for leaks. If an alias you only gave to one company starts getting spam from random sources, you know exactly who sold or leaked your data. That's valuable information.