I'm running into a bit of a problem, more like an annoyance, because Postie treats anything in the subject line before a : as a category, so I can't use colons in my subject lines when I send an email.
I'm using a mailman listserv to send messages to subscribers, one of the subscribers is a dedicated email address for Postie (which captures the email and posts it for non-subscribers to read online). Mailman uses subject headers with [ ] brackets, which Postie also recognizes. So usually a post will come through fine, Postie will strip out the list name from the email subject line (enclosed in [ ]) which becomes the category. The remaining text in the subject line becomes the blog post title.
However, if the subject line of the email has a colon in it too, postie uses the text before the : as the category (which generally produces a "uncategorized" result in WordPress) and what's left after the colon becomes the blog title. I think this is a Postie feature that allows you to add more than one category to a post, but for me it's just causing issues.
Does anyone know if you can disable the colon as a qualifier for categories? I couldn't even find the condition statement in the PHP, but perhaps I'm looking in the wrong file.