On Fri, 11 Mar 2016 12:56:42 -0700, graham > wrote:

>I use Thunderbird for newsgroups. When I try to post, I keep getting a
>“You are not allowed to post” message. I have to re-subscribe to the
>newsgroup each time before the message posts. Damned annoying!!!!!!
>It's not the provider.
>
>Has anyone else had this problem?

Never heard of that one, but not a lot surprises me with T-Bird.
Maybe consider using a proper newsreader? The times I've tried any
Mozilla based email client for Usenet, well, it invariably gets messy.