An email alias is an alternative address that delivers mail to an existing mailbox. If your real address is john@company.com, you can create sales@company.com as an alias, and every message sent to it lands in the same inbox. No new account, no new password, no extra license fee.
That one sentence answers the core question, but the details matter. Aliases behave differently from forwarding rules, distribution lists, and separate mailboxes, and picking the wrong one causes real problems: missed replies, confused recipients, or paying for licenses you never needed.
This guide covers what aliases are, how they compare to the alternatives, how to set them up in Gmail, Google Workspace, and Outlook, and where they stop being useful.
What Is an Email Alias, Exactly?
An alias is a pointer, not a mailbox. It has no storage, no login, and no separate password. It simply tells the mail server that messages addressed to one name should be delivered to another mailbox.
Most platforms also let you send from an alias. That means you can receive mail at billing@company.com and reply as billing@company.com, even though everything actually happens inside your primary account.
The key mental model: one person, one mailbox, many identities. If you find yourself needing separate people to access the mail, an alias is the wrong tool and you want a shared mailbox or distribution list instead.
Email Alias vs Forwarding: The Difference That Trips People Up
Aliases and forwarding look similar from the outside because both result in mail arriving somewhere else. The mechanics are different.
Forwarding takes a message that was delivered to mailbox A and re-sends it to mailbox B. The message crosses the mail system twice, which can affect headers, delay delivery slightly, and occasionally break authentication checks like SPF along the way. Forwarding also usually cannot send outbound mail as the forwarded address without extra configuration.
An alias never involves a second mailbox. Delivery happens once, directly into your inbox, and replying as the alias is typically a built-in option. As a rule of thumb: use an alias when the alternative address belongs to you, and use forwarding when mail genuinely needs to move between two different accounts.
Alias vs Distribution List vs Shared Mailbox vs Separate Account
There are four common ways to handle an address like support@company.com, and they solve different problems.
An alias delivers to one person. It is free on virtually every platform and takes a minute to set up. Good for solo founders and small teams where one person owns a function.
A distribution list (or Google Group) delivers a copy to multiple people. Everyone gets the message in their own inbox, but there is no shared view of who replied, so two people can answer the same email.
A shared mailbox is a real mailbox that multiple people can open. It keeps one conversation history in one place, which makes it the right choice for support and billing queues once more than one person handles them.
A separate account is a full mailbox with its own login and, in Google Workspace or Microsoft 365, its own paid license. Use it only when the address needs independent storage, calendar, or credentials, for example a dedicated outreach mailbox with its own sending reputation.
How to Create an Email Alias in Gmail (Free Accounts)
Free Gmail does not offer true aliases, but it gives you two workarounds that behave almost identically.
First, plus addressing. Mail sent to yourname+newsletters@gmail.com arrives in yourname@gmail.com automatically. Nothing to configure. Combine it with filters and you can label or archive anything sent to a specific variant.
Second, dot variations. Gmail ignores dots in usernames, so john.smith@gmail.com and johnsmith@gmail.com are the same inbox. Both tricks are great for filtering and for spotting who sold your address, though some websites reject plus signs in email fields.
To send from another address you own, go to Settings, then Accounts and Import, then Send mail as, and verify the other address. Gmail will then let you pick it in the From field when composing.
How to Create an Alias in Google Workspace
Google Workspace supports real aliases, and each user can have up to 30 of them at no extra cost.
An admin opens the Admin console, goes to Directory, then Users, selects the user, clicks User information, then Alternate email addresses, and adds the alias. Delivery starts working within a few minutes in most cases.
To send as the alias, the user then goes to Gmail Settings, Accounts, Send mail as, and adds the alias address. Because the alias is on the same domain, no separate verification email is needed and the option is treated as an alias rather than an external account.
Workspace also supports domain aliases: if you own both company.com and company.io, you can map the entire second domain so that every user automatically gets a matching address on it.
How to Create an Alias in Outlook and Microsoft 365
For personal Outlook.com accounts, go to your Microsoft account settings, choose Your info, then Account info, and add an alias. You can create a new outlook.com address or attach an existing email you own, and you can promote any alias to be your primary sign-in.
For Microsoft 365 business accounts, an admin opens the Microsoft 365 admin center, selects the user under Active users, opens Manage username and email, and adds the alias. Each mailbox can hold hundreds of aliases, far more than most teams will ever use.
One historical pain point: sending from an alias in Microsoft 365 was not supported for years. Microsoft added send-from-alias support, but an admin has to enable it at the organization level, and some older Outlook clients still display quirks. Test with a real recipient before relying on it.
Practical Use Cases for Email Aliases
Department addresses are the classic use. A two-person startup can look organized with sales@, support@, and billing@ all landing in the founders inboxes, then graduate those addresses to shared mailboxes as the team grows.
Filtering and tracking is the everyday personal use. Sign up for services with dedicated variants and you can filter ruthlessly and immediately see which company leaked or sold your address.
Role continuity matters more than people expect. When mail goes to partnerships@company.com instead of a personal address, a staffing change means updating one pointer instead of announcing a new contact to hundreds of external relationships.
Cold outreach sender identities deserve a caution rather than a recommendation. Some senders use aliases to test different from-names on one mailbox. That works technically, but aliases share the mailbox and domain reputation underneath, so an alias does not isolate deliverability risk the way separate mailboxes on separate domains do. Platforms like ClickReach rotate sending across genuinely separate mailboxes for exactly that reason: if one identity gets flagged, the damage stays contained.
The Limits of Email Aliases
Aliases have no separate storage or login, so you cannot give someone access to the alias without giving them access to the whole mailbox.
They share reputation with the primary mailbox and domain. Spam complaints against an alias hurt the real account behind it.
Some platforms leak the underlying address in headers or calendar invites, so do not treat an alias as an anonymity tool. If you need true separation, use a distinct account.
Finally, replies from the wrong identity are a constant human error. If you manage five aliases from one inbox, sooner or later you will answer a support email from your personal address unless you set default reply-from rules carefully.
FAQ: Email Aliases
Are email aliases free?
On Gmail, Google Workspace, and Microsoft 365, yes. Aliases do not consume a user license. Only full mailboxes do.
Can I receive replies sent to an alias?
Yes. Replies to an alias arrive in the primary mailbox like any other message, and most clients can auto-select the matching identity when you respond.
How many aliases can I have?
Google Workspace allows up to 30 per user. Microsoft 365 supports several hundred per mailbox. Free Gmail has no fixed cap on plus-address variants because they are generated on the fly.
Does an alias improve deliverability for cold email?
No. Deliverability follows the domain and mailbox behind the alias. To reduce risk in outreach you need separate mailboxes, warmed domains, and sensible volume, not more aliases.
The Bottom Line
An email alias is the fastest, cheapest way to add addresses without adding accounts: one mailbox, many identities. Use aliases for department addresses, filtering, and role continuity. Switch to shared mailboxes when multiple people need access, and to fully separate accounts when reputation or credentials need to be isolated. Set one up today; it takes about two minutes and costs nothing.
