Can't post to a foreign server

[Burkhard Perkens-Golomb]

I've problems to post to a subscribed group of a foreign server.

I open a new posting buffer, in the header "Newsgroup:" i write (with
completion) "nntp+foreign.server:foreign.group" and press C-c
C-c. Gnus doesn't recognize the foreign server but tries to send the
posting to the primary server. So I get the message:

,----
| 441 No valid newsgroups in "nntp+foreign.server:foreign.group" 
| Couldn't send message via news: 441 No valid newsgroups in 
"nntp+foreign.server:foreign.group" 
`----

I've found a thread about a similar problem:

http://groups.google.de/groups?hl=de&lr=&ie=UTF-8&threadm=87vgeles9u.fsf%40bang.priv.no&rnum=1&prev=/groups%3Fhl%3Dde%26lr%3D%26ie%3DUTF-8%26scoring%3Dd%26q%3Demacs%2Bgnus%2B%2522441%2Bposting%2Bfailed%2522%2Bforeign%26btnG%3DGoogle-Suche

In short it says:

,----
| >>>> After a CVS update today, I am no longer able to post to
| >>>> news.gnus.org.  It tries posting to the primary NNTP server:
| >>>>  Sending message 1 of 1...
| >>>>  Sending news with news.chello.no via nntp...
| >>>>  441 Posting Failed (Article NOT Posted to a Valid Newsgroup) 
| >>> 
| >>> `gnus-post-method' is supposed to default to 'current'.  Does it do
| >>> that for you?
| >>
| >> I have the same problem as Steinar here with oort 0.05 snapshot.
| >> gnus-post-method is set to 'current.
| >>
| >> (gnus-post-method 1 "nntp+news:hist.test";) will give (nntp
| >> "nntp-trd.uninett.no"), which is the gnus-nntp-server.  I believe it
| >> should be returning (nntp "news") for stuff to be working.
| >>
| >> I am at a loss on how to fix it, though.
| >>
| > How about
| >
| > (gnus-post-method nil "nntp+news:hist.test";)
| >
| > (I am unable to reproduce the bug.)
| 
| Works wonderfully. (nntp "news")
`----

They're talking about the function "gnus-post-method" and the argument
"1" or "nil". With nil it works.

But I'm not a Gnus hacker, even not a lisp hacker. So what do I have
to do to post to a foreign server?

Thanks,

        Burkhard