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External Sieve Access (Email Filter)

The Sieve service allows you to create and manage server-side filtering rules for your emails. This enables emails to be automatically sorted, forwarded, or deleted upon delivery – even before they appear in your email client.

Access Data for Sieve

The Sieve interface is provided by hosted.mailcow.de. Please use the following connection details:

Server: hosted.mailcow.de
Port: 4190
Protocol: Sieve (sometimes referred to as "ManageSieve")
Authentication: Email and password of the email account

The connection is encrypted. Please ensure that your client uses a TLS-secured connection.

Support by Email Clients

Many modern email clients support Sieve either directly or through extensions. One example is Mozilla Thunderbird, which allows the management of filtering rules with the Sieve extension. After installing the extension, you can directly access and manage your server-side filters.

Things to Keep in Mind

  • The filtering rules are server-side and apply regardless of the device or client being used.
  • When using manual Sieve rules, filters created in SOGo (e.g., forwarding, etc.) will be disabled! Only filters from one source can be used at a time.
  • Please note that Sieve uses the same login credentials as your email account.

If you have questions about the configuration or encounter issues, please contact support via the ticket system.