What a masked email alias actually does
30 July 2026 · 5 min read
A masked alias is an address that belongs to you but forwards to your real mailbox. You hand out the alias. Mail arrives where it always did. Nothing about your reading habits changes.
The one thing it buys you
Control after the fact. Your real address, once given out, is impossible to withdraw. An alias can be paused, locked to one sender, or switched off entirely, and everything else you own keeps working.
Use one per company
The value multiplies when each shop gets its own. Mail arriving at the address you only gave to one company, from somebody else, is evidence that address has spread. With a single shared alias you learn nothing.
What it does not do
- It does not hide you from the company you gave it to. They asked for an address and you gave them a working one.
- It does not stop mail already sent to your real address.
- It does not anonymise you if you sign up with your real name and card.
It is a containment tool, not a disguise. Used that way it is very good: one leak becomes one address you delete, instead of a permanent change to your life.
More on privacy
Most disposable email is not private at all
On many throwaway-mail sites, anyone who types your address can read your inbox. That is not a bug in those products, it is how they are built.
Plus addressing: useful, and easier to strip than you think
you+shop@gmail.com is a fine way to label mail and a poor way to hide anything.
One-time codes are not secret in transit
A six-digit code sent by email is protected by your mailbox, and by nothing else along the way.