I’ve just enabled reply by email on the forum, so now when you receive an email from the website (e.g. for a private message or topic you’ve been notified about) you can just reply to that email to reply to the message without going to the forum first.
(Previously a couple of times people have replied to these notification emails thinking they were sending their replies to the forum but they basically just went to the automated admin email account, so now that shouldn’t be an issue.)