Get started

Use 1Password to create and manage Masked Emails in Fastmail

Learn how to set up and use Masked Emails, unique email aliases that keep your email address anonymous.

With 1Password and Fastmail, you can create and manage Masked Emails for each of your online accounts. Each Masked Email is a unique, randomly generated email address you can use to sign up for a new account to keep your personal address private. You decide when you want to stop receiving email from it.

Set up Masked Emails

Before you can use Masked Emails, you’ll need to sign up for a Fastmail account and set up 1Password in your browser. Then follow these steps:

  1. Sign in to your account on
  2. Click Integrations in the sidebar and choose Fastmail.
  3. Follow the onscreen instructions to connect both accounts.

Now you can use 1Password to create and manage Masked Emails in your browser.

Use Masked Emails

To create and fill a Masked Email, visit a website where you want to create an account. On the sign-up page, select the email address field and choose Create Masked Email. Then click Fill Email.

An email field with Create Masked Email selected and a window with the Masked Email and options to Fill or Regenerate.

If you have multiple Fastmail accounts set up with 1Password, you can choose which account to use. To generate a different Masked Email, click Regenerate.

From now on, Fastmail will deliver all messages sent to the Masked Email to your Fastmail inbox.

After you click Fill Email, enter the rest of the details the website requires. Use 1Password to create and save a strong password for the login.

Manage Masked Emails

If you receive unwanted messages at a Masked Email, you can block incoming email for it.

  1. In your browser, click the 1Password icon and enter the Masked Email you want to block in the search field. You’ll see the Login item details.
  2. Click next to the email address.
  3. Adjust your forwarding settings:
    • To turn off forwarding, click Block Incoming Emails.
    • To resume forwarding, click Unblock Incoming Emails.
1Password in the browser open to the login item for with the option to Block Incoming Emails highlighted in the dropdown next to the Masked Email.

To block incoming email to the alias from Fastmail, click Settings > Masked Email.

Get help

Creating and managing Masked Emails requires 1Password in your browser.

To delete a Masked Email, sign in to your Fastmail account and click Settings > Masked Email , then Delete.

To stop using your Fastmail account with your 1Password account:

  1. Sign in to your account on
  2. Click Integrations in the sidebar.
  3. Click Active and select the Fastmail email you want to remove.
  4. On the settings page for the account, click Deactivate.

Learn more

Still need help?

If this article didn't answer your question, contact 1Password Support.