SPF records and DKIM signatures on ubuntu/postfix/mailman

Robin Paulson <[email protected]>
Newsgroups gmane.org.user-groups.linux.new-zealand.general
Message-ID <[email protected]>
 i setup a public mailman discussion list recently, and the people who 
 are subscribed via gmail are getting the following warning when they 
 open messages sent via the list:
 "This message may not have been sent by: <subscriber>@gmail.com  Learn 
 more  Report phishing"

 the warning includes a link to this page, which gives a fairly 
 comprehensive explanation:
 https://mail.google.com/support/bin/answer.py?hl=en-GB&ctx=mail&answer=185812

 however, i'd like to get some further views on the matter.
 is this a major enough problem to warrant doing anything about?
 are users likely to unsubscribe when they see this message?
 any suggestions on the best way to implement it, on a postfix/ubuntu 
 lucid system?
 anything else which is relevant?

 cheers,

-- 
 robin

 http://fu.ac.nz - Auckland's Free University

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