Email alias vs. separate inbox: what's the difference?

Email aliases and separate inboxes are often discussed as if they solve the same problem.

They do not.

An alias changes the address you give someone.

A separate inbox changes where the resulting mail lives.

That distinction matters.

What an email alias does

An alias is another address that usually routes mail to an existing mailbox.

This can be useful for:

Aliases are powerful because the sender never needs to know your real destination mailbox.

If the alias forwards into your regular inbox, the marketing still arrives in your regular inbox.

You may be able to filter it.

You may be able to disable the alias.

But the default destination is still the inbox you were trying to keep quiet.

A separate shopping inbox creates a different boundary.

The email does not arrive in your main mailbox at all.

You go somewhere else when you need it.

A free second Gmail account can do this.

So can a purpose-built signup inbox.

SpamCatcher is not designed around creating a different alias for every merchant.

It gives the user one steady SpamBox identity for low-sensitivity signups.

That means it offers less traceability than a per-company alias system.

In exchange, the mental model is extremely simple:

This is the email I give the noisy stuff.

Use aliases if you want address-level control and traceability.

Use a separate mailbox if your primary goal is keeping entire categories of email out of your everyday inbox.

Use a normal second mailbox if you want full email features.

Use a dedicated SpamBox if you want the separation without the rest of a full email account.

The tools are not interchangeable.

Choose based on which boundary you actually want.

Updated 2026-09-10