You can subscribe with an email that contains a typo

[obotisan]

[Affected versions]:

• Firefox 62.0
• Firefox 63.0a1

[Affected Platforms]:

• Windows 10 x64
• macOS 10.13
• Ubuntu 16.04 x64

[Steps to reproduce]:

1. Access this link: https://fx-breach-alerts.herokuapp.com/
2. Click on the "Subscribe" button.
3. In the email field write an email address that contains a typo (e.g. test@gmsil.com).

[Expected result]:

• An error that the email address is invalid or asking if the user wanted to write "@gmail.com" is displayed.

[Actual result]:

• The subscription is done successfully.

[Regression]:

• I don't think this is a regression.

[Notes]:

• Please look at the attached gif.

[pdehaan]

I believe fxa-content-server uses mailcheck to check for some domain typos. We could sync up with them and see how that’s working out, or if they have any other suggestions.