How to Set Up an Email Alias for Business (Alias vs Mailbox)

An email alias is an extra address that delivers into a mailbox you already have, so sales@yourcompany.com can land in the same inbox as jane@yourcompany.com without a second login. This guide explains what an alias is, when a real mailbox is the better choice, and how to set one up and reply from it correctly.

Quick answer

An alias is a label, not a mailbox. It has no password, no storage of its own and no separate login. Mail sent to the alias is delivered into the parent mailbox, and you choose the alias as the From address when you reply. A mailbox is a full account with its own credentials, quota and IMAP access. If the address needs to be used by a different person, or needs to survive someone leaving, make it a mailbox.

When an alias is the right tool

• One person handles several roles: a solo founder who answers hello@, sales@ and billing@ from a single inbox.
• You want a throwaway address for a signup or a vendor portal, so you can retire it later without losing anything.
• You need a display variant of your own name: j.smith@ and jsmith@ both reaching the same person.
• Marketing wants a campaign-specific address like spring@ that only lives for a season.

When you need a real mailbox instead

• Two or more people need to read and answer the address on their own devices.
• The address will be used to sign in to third-party tools, so it needs its own password and its own password resets.
• Mail volume is high enough that it would swamp a personal inbox and needs its own storage.
• The address must outlive the person: support@ should not disappear when your support lead changes jobs.

Step by step: create and use an alias

1. Open your mail host's admin panel and find the mailbox that should receive the alias mail.
2. Add the alias address (for example sales@yourcompany.com) under that mailbox. Aliases are usually limited to domains you have verified.
3. Send a test message to the alias from an outside account such as Gmail and confirm it arrives in the parent inbox.
4. In your mail app, add the alias as a sending identity. In Thunderbird this is Account Settings, then Manage Identities. In Apple Mail, add it comma-separated in the Email Address field of the account. In Outlook it is a separate "send as" address, and in Gmail (if you route mail through it) it is Settings, Accounts, Send mail as.
5. Create a filter that tags or folders mail addressed to the alias so you can tell sales@ from personal mail at a glance.
6. Reply to the test message and check the outgoing From header shows the alias, not the parent address.

What most hosts get wrong, and a simpler route

Some hosts charge for aliases, cap them at a handful, or only allow forwarding to an external address, which breaks replies. On OquMail's free plan you get up to 15 mailboxes across 3 domains, each with 5 GB, so a role address like sales@ can simply be its own mailbox. Give it a password, connect it with IMAP on mail.oqumail.com port 993 alongside your personal mailbox, and it behaves exactly like an alias in your mail app while remaining a real account you can hand to a teammate later.

Mistakes to avoid

• Replying from the parent address. Customers who wrote to sales@ and get an answer from jane@ will save the wrong address and your future hire never sees the thread.
• Using an alias as a login for SaaS tools. The tool sends password resets to it, and if you later delete the alias you lose the account.
• Forgetting SPF and DKIM apply to the alias too. An alias on a second domain needs that domain's DNS set up as well.
• Creating dozens of aliases nobody monitors. Every unmonitored address is a place a customer's message can die quietly.

Common questions

Can I reply from an alias in my phone mail app?

Usually yes. iOS Mail lets you pick any address listed under the account's Email field when composing. Outlook mobile supports aliases that the server exposes. If your app cannot switch the From address, use webmail for replies that must come from the alias.

Does an alias count as a user for billing?

On most paid suites an alias is free but a mailbox is billed per user per month. On OquMail's free plan the distinction does not matter up to 15 mailboxes, which is why many small teams just create mailboxes and skip alias limits entirely.

What is the difference between an alias and forwarding?

An alias delivers into a mailbox on the same host and you can reply as that address. Forwarding sends a copy to a different address, often on another provider, and replies come from that other address unless you configure send-as. Forwarding also fails SPF at the receiving end more often, so aliases or mailboxes are the safer choice for customer-facing addresses.