@jjohansen, I've tested your build and can confirm it fixes the issue.
root@host:~# uname -a Linux host 3.19.0-31-generic #36+lp1446906v3 SMP Fri Dec 18 08:37:50 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
root@lxc:~# mailq Mail queue is empty
@jjohansen, I've tested your build and can confirm it fixes the issue.
root@host:~# uname -a
Linux host 3.19.0-31-generic #36+lp1446906v3 SMP Fri Dec 18 08:37:50 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
root@lxc:~# mailq
Mail queue is empty