John, I had the same problem with Yahoo. After about 3 tries I finally got it to accept me. When you finally get it to work, it works just like SailNet used to work, including showing the email of the sender. Most of the people have moved over there. Just keep trying.
I don't think SailNet has realized how bad they have screwed up. I would always spend a few boat buck with them each years to support them and the message board. I don't think they will be able to depend on that revenue any more.