Recently messages from someone I frequently get emails from are not showing up in my inbox. I see the message come in on my phone client, but when I go to Thunderbird they aren't there. When I do a search for the persons name, the message shows up and says it is in my inbox. The message is part of a thread, but I do not have Display Message Threads active (I have tried switching this on and off). I have no filters on (I have other messages from this person still in my inbox) and I have checked my Junk folder, but like I said when I search for the email it says 'Inbox'. In fact all the messages on this thread from this person do not show up in my inbox, but on search all say 'Inbox'. The original message on this thread was sent by me. There is an older message from this person in my inbox with the same subject line, but it is not part of this thread.