Sometimes it works, sometimes it doesn't. I'm using google groups UK
at present, the posting works for about 70% of the threads on
comp.programming.

The others, including this one give errors when you try to post, such
as:
"Unable to retrieve message 4240CBA5.79360276@yahoo.com". For this
message I had to copy and paste the quoted text manually.

Note, this is just as bad as groups.google.com, where the default
behaviour of a posting is to quote nothing at all.

Since both interfaces are knackered in some way or other I'm currently
attempting to use a mixture of both, which sort of works, but is still
much worse than the good old days when groups.google.com worked
properly.