better display of incoming email messages in database
Thank you @demerit and @jitendra for your help!

It turns out, the answer is: don't change the label for the Incoming Email activity type :).

The user changed it from Incoming Email to just Email. Changing the label should definitely not break things - but since this issue is still open, it does. 

So, in the short term, I'll change the label back. In the long term, getting 1116 fixed would be ideal.