[TO LIST OWNER] Posting problems when subscribed with non-gmail address

I am trying to post to the list, after having succesfuly subscribed to it with a non-gmail address.

I receive list emails, but when I try to post I just get back the canned email response from google that says "Posting error: Ruby on Rails: Talk - You do not have permission to post to group rubyonrails- talk."

This is how I've subscribed.

I've sent a blank email to <rubyonrails-talk- subscribe@googlegroups.com> and I've confirmed my subscription by clicking on the link sent back by google, which redirects me to a page saying that I should be able to post by sending email to rubyonrails- talk@googlegroups.com

I have also tried to contact the list owner via the googlegroups online form, but to no avail.

Any clues? I really hate the Google UI for posting.