What is SenderID?SenderID is a sender authentication protocol. It is a method for a domain to specify which hosts are allowed to send email on behalf of that domain. The sending domain adds a specially formatted record into its DNS zone file identifying all authorized mail servers. A receiving mail server checks the sending domain's DNS zone file to see if the IP address from which the message is originating matches one of the authorized IP addresses.
The technical specifications for SenderID are contained in the following three documents:
These specifications have been released as experimental RFCs.
Additional information about SenderID can be found at http://www.microsoft.com/senderid. This web site also includes a wizard which will create SenderID records.
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