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Signup doesn't allow '+' in the email address, which is sometimes used in Gmail email addresses.

Edit: Plus `## Creating contact lists` in the docs doesn't seem to have rendered properly.

Good catch - That'd be down to the regex in the front end. Will look into it

You shouldn’t use regex for email validation.

The backend (Django) also verifies that the email address is valid. The frontend validation is just added as a an extra convenience

The problem is the standard for what is a valid email address is so varied with enough edge cases that what you might consider a “convenience” is actually breaking the site for other people.

There are quite a number of articles written about this topic, I’d recommend researching it.

Allowing + is bad. It allows users to churn trials easily.

That can be prevented with simple validation on sign up.

Accept the address and key the user based on the part preceding +.

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