Vista - Problems uploading newsgroup posts to Tera News

I'm having problems uploading any newsgroups posts to Tera News.
A few weeks ago, I downloaded more than their limit for one day,
and decided to wait out the resulting restriction instead of paying them
more. I finally found the information on how to set up the account, and
used this to restore the ability to download since Windows Mail
forgot my password for this account. Even several days afterwards,
though, I have not been able to upload any posts there again. Asking
their level2 email address for help has given no results even after a few
weeks. Asking their help email address for help gave only an
automated response to do a few things at this website, without
including any clear instructions on how to find which website they were
referring to:

http://www.teranews.com/manageaccount.html

Typical error message from trying to upload a post:

Windows Mail could not post your message. Subject 'Re: Crematie
Bloemen.rarCrematie Bloemen.rar (01/89)', Account: 'free.teranews.com',
Server: 'free.teranews.com', Protocol: NNTP, Server Response: '403 Remote
Server Unavailable', Port: 119, Secure(SSL): No, Server Error: 403, Error
Number: 0x800CCCA9

This was a rather short reply saying mainly that they forgot to
include yEnc in the subject line, with very little of the post
I replied to quoted (only enough to show that it came in
yEnc format).

I've already applied the change here for adding @teranews.com
to the end of my username; it doesn't help with the uploads
problem.

http://www.teranews.com/

Unfortunately neither of the two other newsgroups servers I
use carries binaries any more; I've already moved my
non-binaries newsgroups to one of the other two servers
where possible.

I've stopped recommending Tera News as a place to get
a nearly free newsgroups server offering binaries.

<robertmiles@xxxxxx> wrote in message
news:eTgwt1dOJHA.584@xxxxxxAlthough I haven't seen any responses to the above post yet,
my 9 accumulated outgoing posts for that server just uploaded.
Only one one them showed up for downloads, though.
Maybe the people who are supposed to read email to their
level2 email address are busy reading this newsgroup instead,
and only do something about problems if they are reported in
this newsgroup.

They could make it easier to reach people there who will
actually do something to fix the problems, even if they
decide not to send a response.