Yahoo and their mail filters..

[johnl at iecc.com (John R. Levine)]

>> AOL sends its spam button feedback in industry standard ARF format. It
>> took me about 20 minutes to write a perl script that picks out the
>> relevant bits from AOL and Hotmail feedback messages and sends unsub
>> commands to my list manager.
>
> Yes, but you're using qmail and ezmlm which send separate copies of the
> message to each recipient, with the recipient's address embedded in the
> return path.

Actually I'm using majordomo2, but you're right, it does single deliveries 
which helps do

> If, like us, you have a setup that's optimised to de-duplicate 
> multi-recipient messages, AOL's redaction makes their ARF messages mosly 
> useless for anything but rough detection (or confirmation) of a 
> compromise.

Sounds like it might be time to reconsider your mailing list config.  A 
decade ago, bandwidth was really expensive and it made sense to try to 
load up lots of recipients per delivery.  These days it's essentially 
free, and any saving in bandwidth is swamped by the extra manual effort of 
having to do bounce management by hand.

R's,
John