Don't be brief

By the way, I'm now receiving daily and well edited mail from WriterL and it sure seems promising. The thread running at first was about Polishing (your text) and has run on to Rhythm and Pacing. The welcoming email is a fine followup on their initial pickup line as they're explicitly saying that they

don't have any length limitations for posts, so when you join the discussion, please feel free to take the space necessary to clearly make your point.

That's a fine and serious invitation, isn't it?