The technical bits are technical but basically Yahoo has made it so it's users cannot properly post to mailing lists without unsubscribing themselves.
Your best choice is to switch to something like gmail and have yahoo forward your old mail. It is a pain but unless yahoo reverses course soon it may become even more necessary.
You would think yahoo wouldn't want that.
On April 9, 2014 10:02:51 PM EST, Halldor Skaptason <[log in to unmask]
A test to see my posting address.
In Service to the Dream
Lord Halldór Skaptason
Time is precious, But truth is more precious than time
Sent from my phone. Please excuse my brevity.