[Bug] Some email replies don't go through

I've noticed that some of my replies by email don't come through... For example, I've sent a reply to this thread (I have a question about extracting pages. When I do the function, adobe saves the individual files as "<file name><spac…) and it never arrived, so I posted it via the thread itself. I have a suspicion it might have to do with the use of special symbols in the title (quotes, smaller-than, greater-than, etc.), but this is just a guess. Anyone else experiencing this behaivour?