The problem is in `nnimap-transform-headers', and I don't quite
understand the logic at the moment...



In GNU Emacs 26.0.50.5 (x86_64-pc-linux-gnu, GTK+ Version 3.20.9)
 of 2017-01-20 built on mouse
Repository revision: 82a5e4dc889ecbfa35374616fe9c5edfa23f4504
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description:	Ubuntu 16.10


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   bloggy blog: http://lars.ingebrigtsen.no