how to allow user sign up in gitlab but restrict their email to specific domain?

Question

I can enable user sign up by edit config/gitlab.yaml

## Users management
signup_enabled: true          # default: false

I want to restrict user email to domain mycompany.com when signuped so that only people in my company can create a gitlab account. such as:

tom@mycompany.com   # ok to sign up
jerry@mycompany.com # ok to sign up

abc@example.com # disallow to sign up

how to configure it in gitlab?

Answer 1

2013: That was recently requested (issue 4413), but not yet implemented.

Implemented in 2016 (Merge Request 598, GitLab 7.11, May 2015) in the Admin Area:

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Original answer (2013):

That would be similar to the Atlassian Confluence setting:

So pull requests are welcome.

[edit]
Feature request was moved here.

Answer 2

This was implemented, you can find the white/black list in the admin under Settings.