Hi,
I don't know what could be the problem, but got two pointers which MAY lead to the solution.

Posting Messages to localhost
Article Rejected, deleting: - 437 Unwante
d newsgroup "news.announce.newusers"
Article Rejected, deleting: - 437 Unwanted newsgroup "

This may be related with some settings of innd (in /etc/news or something similar). I had a problem with old messages which were being sucked buy my local inn server discarded them with an error. I had to change the expiry setting (I don't remember right now what exactly).

As for this one:

/etc/suck/sucknewsrc: Permission denied
Moving newsrc to backup: Permission denied
lex1@xstation:~$

This is rather straightforward - you're running suck from the unpriviledged user - and he has no permission to mess with /etc/suck/* files. Running as root or dedicated user with proper permissions should solve this.