[poky] Default list settings: avoid duplicate mail

[Darren Hart]

I've noticed that poky at yoctoproject.org and yocto at yoctoproject.org both 
default to avoiding sending of duplicate mail. This is different to most 
other lists I subscribe to. By default it makes to me to allow users to 
perform their own filtering. Is there a reason we're disabling 
duplicates by default?

It is a per-user setting, so I was able to enable duplicates for my account.

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel