Welcome to the SenderID/SPF/DomainKeys Test Server.

SenderID and DomainKeys were developed to prevent email address forgery and to identify spam, worms, and viruses. This server allows you to check the format of any DomainKey, SenderID or SPF records published by your domain and to see the result of these authentication checks on any message you send to it.

About SenderID & SPF
Domain owners must identify their sending mail servers in by IP Address in new DNS records. Receivers verify the Purported Responsible Address (PRA) against the information stored in DNS to reject unauthorized messages. SenderID is the evolution of the Sender Permitted From (SPF) proposal developed by Meng Weng Wong and the CallerID proposal developed by Microsoft.

For more information on SenderID and SPF, check the following links:

http://www.microsoft.com/mscorp/safety/technologies/senderid/default.mspx
http://spf.pobox.com/

As of 2/21/05, the current set of drafts we support is:

draft-lyon-senderid-core-00.txt
draft-lyon-senderid-pra-00.txt
draft-lentczner-spf-00.txt
draft-ietf-marid-submitter-03.txt

About DomainKeys
Domain owners must include a digital signature in outgoing messages and publish their public key in new DNS record. Receivers verify the signature against the public key available in DNS to reject unauthorized messages. DomainKeys was developed by Yahoo!.

For more information on DomainKeys, check the following link:

http://antispam.yahoo.com/domainkeys

As of 11/16/04, the current set of drafts supported by this tool is:

draft-delany-domainkeys-base-01.txt

Using This Tool
To use this service, send an email to any address at ww.returnpath.net - a random address has been provided for you:

q1n75@ww.returnpath.net

Once you have sent your message, click "View Sample" below to see your message results. It may take a few minutes to receive the message. You may also enter in the address of a previously entered test.