Digitally sign your email with DKIM (DomainKeys Identified Mail) and help prevent email spoofing on your side. DKIM adds a private key which stays in your server and a public key that stays in your DNS record. The outgoing email header that you send gets encrypted and the recipient servers then retrieve the public key to decrypt the incoming headers and verify that the messages really comes from your domain and was not altered while it is on transit.
Webmin, Virtualmin and Usermin powered servers
Virtualmin is configured to setup DNS zones but this system is not setup to use itself as a DNS server
Failed to save enabled features : Virtualmin is configured to setup DNS zones, but this system is not setup to use itself as a DNS server. Either add 127.0.0.1 to the list of DNS servers, or turn off the BIND feature on the module config page.
This is a generic error telling the website administrator that the local DNS entries are being checked using external methods. Most of the time, this wont be a real issues but it causes a performance spike which depends highly on where the DNS entries are being searched.
Virtualmin is an advance, powerfull and flexible web hosting control panel for your Linux and UNIX system. It is the virtual host magement module of the well-known Open Source web-based server management system Webmin. With virtualmin, you can manage multiple virtual hosts, multiple virtual domains, mailboxes, database, applications and other stuff from its comprehensive and friendly web interface.
Virtualmin is a comprehensive and excellent replacement for your cPanel and Plesk control panels . Virtualmin offersr the same features that you can find from the two mentioned control panels such as account creation, domain management, dns management, MySQL management and much more. Virtualmin also offers a control panel for non-root users for management of their hosting account.