This page can turn on or off the automatic mail client configuration URL for all virtual servers with email enabled. Clients like Thunderbird can use this URL to detect SMTP and IMAP settings based on only an email address, including the correct username, port number and encryption type.

When enabled, a sub-domain named `autoconfig` is created for each virtual server, and the URL path /mail/config-v1.1.xml is mapped to a CGI that serves XML to supply the required mail client parameters. These will be removed when the feature is disabled.