Re: SPF records and DKIM signatures on ubuntu/postfix/mailman

Just looking at this quickly (I've seen such cases in the past), this 
sort of issue crops up when the sending IP & the domain-lane to not 
quite match up.

SPF is a way to "bless" specific IP's with the authority to send mail 
for a particular domain, and is a value assigned to the TXT attribute of 
your domain's DNS.
In the past I've used openspf.org to do a quick, back-of-the-envelope 
calculation that would pass muster, but have not used it in a while.
In most cases "v=spf1 mx a ~all" (I think) is good enough.

Ensuring your rDNS is set up correctly would also help to vastly improve 
your "IP reputation"

- Jaco

On 11/10/14 13:52 , Robin Paulson wrote:
> 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,
>

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