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---
type: reference
---
# Sign-up restrictions
You can block email addresses of specific domains, or whitelist only some
specific domains via the **Application Settings** in the Admin area.
>**Note**: These restrictions are only applied during sign-up. An admin is
able to add a user through the admin panel with a disallowed domain. Also
note that the users can change their email addresses after signup to
disallowed domains.
## Whitelist email domains
> [Introduced][ce-598] in GitLab 7.11.0
You can restrict users to only signup using email addresses matching the given
domains list.
## Blacklist email domains
> [Introduced][ce-5259] in GitLab 8.10.
With this feature enabled, you can block email addresses of a specific domain
from creating an account on your GitLab server. This is particularly useful to
prevent spam. Disposable email addresses are usually used by malicious users to
create dummy accounts and spam issues.
## Settings
This feature can be activated via the **Application Settings** in the Admin area,
and you have the option of entering the list manually, or uploading a file with
the list.
Both whitelist and blacklist accept wildcards, so for example, you can use
`*.company.com` to accept every `company.com` subdomain, or `*.io` to block all
domains ending in `.io`. Domains should be separated by a whitespace,
semicolon, comma, or a new line.
<!-- ## Troubleshooting
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[ce-5259]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5259
[ce-598]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/598
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