Email Authentication Report.pdf

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Publishing SPF sender SPF sender ID Verifying signs DK Authentication ISP net Email Authentication Report

 
 
Email Authentication Report             
 
ESPC Email Authentication Report 
 
Executive Summary: 
Over the past months, the ESPCs Receiver Relations Committee, a group dedicated to helping facilitate better 
understanding and ongoing dialogue between the sender community and the established receiver community, 
collaborated with leading ISPs and compiled authentication information about their email programs.  The result 
of their efforts is a report providing a list of ISPs and the types of email authentication they currently support for 
either IP-based (Sender ID and SPF) or cryptographic (DomainKeys and DKIM) solutions. The report is a 
powerful representation of the broad based endorsement of authentication by receivers today. 
 
Results: 
ISP 
Status 
Version 
Filter 
Notification 
  
  
  
  
Pass 
Fail 
AOL  (aol.com) 
Publishing 
SPF/Sender-ID 
No 
None 
None 
CompuServe (compuserve.com) 
Publishing 
SPF/Sender-ID 
No 
None 
None 
Netscape (netscape.com) 
Publishing 
SPF/Sender-ID 
No 
None 
None 
Bellsouth (bellsouth.net) 
Verifying 
SPF 
No 
None 
None 
Charter (charter.net) 
Publishing 
SPF 
No 
None 
None 
Comcast (comcast.net) 
Publishing 
SPF 
No 
None 
None 
Cox (cox.net) 
Testing  
DKIM 
No 
None 
None 
EarthLink (earthlink.net, mindspring.com, 
peoplepc.com) 
Publishing 
DK 
No 
None 
None 
Google (gmail.com) 
Verifying/ 
Publishing/Signing 
SPF/DK 
Yes 
Yes 
Yes 
Juno/NetZero (netzero.net, juno.com) 
Publishing 
SPF/Sender-ID 
No 
None 
None 
Microsoft (msn.com, hotmail.com) 
Checking/Publishing SPF/Sender-ID 
Yes 
Yes 
Yes 
RoadRunner (rr.com) 
Publishing 
SPF 
No 
None 
None 
Verizon (verizon.net, gte.net, 
bellatlantic.net)** 
Publishing 
SPF 
No 
None 
None 
Yahoo! (yahoo.com) 
Verifying/Signing 
DK 
Yes 
Yes 
Yes 
SBCGlobal (sbcglobal.net)* 
Verifying/Signing 
DK 
Yes 
Yes 
Yes 
Britsh Telecom (btinternet.com) 
Verifying/Signing 
DK 
Yes 
Yes 
Yes 
Rogers Cable (rogers.com) 
Verifying/Signing 
DK 
Yes 
Yes 
Yes 
Rocket Mail (rocketmail.com) 
Verifying/Signing 
DK 
Yes 
Yes 
Yes 
International domains (Yahoo UK, CA, 
Hong Kong, France, India, Twain, Mexico, 
China, Italy)  
Verifying/Signing 
DK 
Yes 
Yes 
Yes 
* A portion of legacy domains not verifying or signing at this time 
** A small number of accounts hosted by Yahoo! are verifying and signing
 
 
Email Authentication Report             
 
Key: 
Status: 
Type:  
Verifying: ISP is checking for existence of authentication on incoming email 
IP based: validating the source (IP address) of message 
Publishing: ISP is publishing SPF/Sender ID record for outgoing mail  
Crypto: validating the sender (signature) of message 
Signing: ISP is attaching a DK signature to outgoing email  
 
Testing: ISP is evaluating either inbound or outbound authentication 
protocols 
 
 
Version:  
Sender Policy Framework (SPF): Authentication standard that specifies what IP addresses can send mail for a given domain.  
     Requires change to DNS records to implement.  
SenderID: Authentication standard based on SPF that expands the verification process to include the purported responsible  
     address (PRA) included in the header. Requires change to DNS records to implement. 
DomainKeys (DK): Authentication standard that signs each outgoing message with an encrypted key. Requires changes in how  
     messages are constructed to implement. 
DKIM: Enhanced encrypted standard that combines Domain Keys and Identified Internet Mail standards. Requires changes in  
     how messages are constructed to implement. 
 
Filter:  
Indicates if ISP weighting authentication (positively or negatively) in delivering messages. This is an ongoing process in  
which ISPs are increasingly adopting authentication standards and determining how to treat incoming email based on the 
usage of those standards.   
 
Notification: 
Pass: ISP provides notification to recipient that message has passed an authentication check. 
Fail: ISP provides notification to recipient that message has failed an authentication check.