See this from Microsoft web site: ( http://www.microsoft.com/mscorp/safe...d/default.mspx )
The Sender ID Framework is an e-mail authentication technology protocol that helps address the problem of spoofing and phishing by verifying the domain name from which e-mail messages are sent. Sender ID validates the origin of e-mail messages by verifying the IP address of the sender against the alleged owner of the sending domain. Now adopted by more than 10 million domains worldwide, Sender ID is providing brand owners, senders, and receiving networks with significant business and technical value.
My question is:
Does Zimbra support SPF? Or it is supported by open source projects included in Zimbra but not automatically as default?