https://lists.exim.org/lurker/message/20160102.121331.acdaa74e.en.html
https://lists.exim.org/lurker/message/20160311.150529.412cdd3b.en.html

https://lists.exim.org/lurker/message/20160311.152537.c36e1ace.en.html

https://bugs.exim.org/show_bug.cgi?id=1807

http://git.exim.org/exim.git/commitdiff/93cc2d6e053031a7008f73ca1ea072038bfa3fc8
http://git.exim.org/exim.git/commitdiff_plain/93cc2d6e053031a7008f73ca1ea072038bfa3fc8
http://git.exim.org/exim.git/patch/93cc2d6e053031a7008f73ca1ea072038bfa3fc8