Email Authentication

The battle against email spam has long been an interest of mine. Recently, I've had a couple of situations making me look into the current state of spam detection and avoidance. Specifially:

ThoughtWorks contracted MessageLabs to filter all inbound email. More and more companies are setting up spam filters, but fewer companies and looking into how to prevent their own email from getting filtered.
A new project at an Australian Bank is sending email to clients. Nothing has been done to see how we can send email and help reduce phishing, or how customers can verify that an email was actually send by the bank.

There are several technologies which help spam filters fitler spam. This includes DomainsKeys, SPF, and SenderID. SPF is probably the easiest to implement, so I thought I'd check to see which major banks are using it. Here's the results:

Major US Commercial Banks
Name	Has an SPF record
Bank of America Corp.	Yes
Citigroup	Yes
Chase	Yes
National City Corp	No
JPMorgan	Yes
Wachovia	Yes
Wells Fargo	Yes
US Bank	Yes
SunTrust Banks	No

Major Australian Commercial Banks
Name	Has an SPF record
ANZ	No
Commonwealth Bank	No
HSBC Australia	Yes
Macquarie	No
National Australia Bank	No
WestPac	No
St. George	No

Here's some tech companies I decided to take a look at.

Select 'technology' companies
Name	Has an SPF record
Apple	Yes
Yahoo!	No
Google	Yes
ThoughtWorks	No
Microsoft	Yes
Message Labs	No
O'Reilly Media	Yes
IBM	Yes
Accenture	Yes
Electronic Data Systems	No

References