Greylisting and Yahoo Mailinglists

[Ted Mittelstaedt]

> -----Original Message-----
> From: owner-freebsd-questions at freebsd.org
> [mailto:owner-freebsd-questions at freebsd.org]On Behalf Of Heiko Wundram
> (Beenic)
> Sent: Tuesday, January 15, 2008 1:13 AM
> To: freebsd-questions at freebsd.org
> Subject: OT: Greylisting and Yahoo Mailinglists
> 
> 
> Hey all!
> 
> A colleague of mine tracks a Yahoo mailing list, but always gets 
> mails from 
> them with a large delay (or not at all) due to our mailserver doing 
> greylisting.
> 
> This comes from the fact that the triplet that represents a 
> message sent from 
> a Yahoo mailing list changes with every message (because the 
> envelope-sender 
> _always_ contains a unique ID to do bounce detection).
> 
> Additionally, I can't seem to make out a set of "subnets" from which the 
> messages arrive; I've so far identified at least five subnets 
> that Yahoo uses 
> to send messages out (and I'm hesitant to add five subnets to the 
> whitelist, 
> especially when they're not closely related in any way as Yahoos 
> subnets seem 
> to be: 66.94.237, 66.163.168, 66.163.169, 69.147.103 and 
> 209.131.38 is what 
> I've seen so far from old messages at a quick glance).
> 
> Anybody here have the same problem, and has rules for whitelisting Yahoo 
> mailing lists properly?
> 

whois -h whois.arin.net xx.xx.xx.xx  will tell you who the subnet
is assigned to.  If it is Yahoo then whitelist them, that's what
the whitelist mechanism is there for.

Yahoo has lots of subnets.  You will have to find and add to your
whitelist based on where the attempts come from.  It is easy to write
a simple awk/grep script that will give you those numbers all formatted
up and ready to paste into your whitelist.

Ted