I don't know if this is a bug or just a warning to other users: If you include a relative link in a blog post, that link does not work in the emailed copy of the blog.
Blog contains < a href="/node/1234" > click here < / a >
It'll work on the groupanizer website, but the email notification will have the same relative link to /node/1234, instead of to http://your-domain.groupanizer.com/node/1234, which obviously won't do. :)
If you can fix it, please do. If not, this is a warning to everyone else: Don't do that! :)