Runbox SPF
Sender Policy Framework (SPF) is an extension to the email transmitting protocol that allows email services to verify the origin of a received message, thus helping counter forged, unsolicited email (spam).
Email services receiving email from the Runbox domains may verify that the messages actually originate with the Runbox servers by looking up the SPF information in Runbox' DNS records.
Official Runbox "Sender Policy Framework" information
If you use your own domain and host your email with Runbox, you can use Runbox' SPF (Sender Policy Framework) information to ensure recipients that your outgoing messages actually originate with your domain at Runbox. Thus, recipients will know that messages appearing to come from your domain are not forged by spammers.
To do this you must include Runbox in your list of approved senders. Modify your DNS records to include the following in your zone file:
yourdomain.com IN TXT "v=spf1 a mx a:cujo.runbox.com a:aibo1.runbox.com a:gaspode.runbox.com ~all"
More information about SPF
