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Rainloop App


Please note this app is not available anymore since upstream development has stopped.


Rainloop is a simple, modern & fast web-based email client.

Default Setup

Rainloop is pre-configured for use with Cloudron Email. The app automatically generates domain configuration for all the apps that have email enabled at installation time. If you enable or disable email on one or more domains, simply reconfigure the app and it will re-generate the necessary configuration.

Multi-domain Setup

There are two ways to use Rainloop when using Cloudron Email with multiple domains.

  • Users can login with their email and password to access their mailbox. If the Cloudron has two domains, and, the user can login using and Aliases can be added as identities under Rainloop settings.

  • Users can login using one of the email domains and add the other domains using the Add Account dialog. For example, user can login as and add in the Add Account dialog.

    Multiple accounts

    Rainloop tracks accounts based on the login email. This means that in the example above, if the user logs in, the id will not show up.

External domains

To add one or more external domains, add them in Rainloop's admin panel.

Vacation Email

An out of office / vacation mail message can be setup using Sieve filters.

A vacation message can be set in Settings -> Filters -> Add a filter. Choose Vacation message action.

At most once a day

Vacation messages are sent at most once a day to the same sender. This setting cannot be changed.

Forwarding all emails

To forward all emails to an external mail, setup a Sieve filter in Settings -> Filters -> Add a filter -> Forward to

Admin panel

The admin panel is located at /?admin and is disabled by default.

To enable it, open a File manager and edit the file /app/data/_data_/_default_/configs/application.ini. Set the value of allow_admin_panel to On. The default admin credentials are:

Username: admin
Password: 12345

Restart the app for the changes to take effect.

Disable admin panel after use

We highly recommend disabling the admin panel after use.

Attachment size

To adjust the attachment size, change the PHP configuration and the Rainloop configuration.

  • For PHP configuration, edit /app/data/php.ini using the File manager and add
upload_max_filesize = 40M
post_max_size = 40M
  • For Rainloop configuration, edit /app/data/_data_/_default_/configs/application.ini using the File Manager and adjust attachment_size_limit.

Be sure to restart the app after making the above changes.

In addition to above, you also have to configure the mail server to allow large email.