On 1/3/2017 8:12 AM, Christoffer G. Thomsen wrote: > blacklist or increase score for mails that reply to unknown > message IDs.
Remember that someone out in the world might do a "Reply all" to a message which was also Cc'd to one of your users. This would show up as an unknown message ID. Of course,to remedy this, you could also keep track of incoming message IDs.
