Comment 7 for bug 1633220

The related FTBFS is fixed in 1636781, now waiting for a few things to settle on zesty release that just opened to be able to go on.

It would be great to have some early verification for what I plan to bring to zesty, so I build the same for yakkety and made it available at a ppa: https://launchpad.net/~paelzer/+archive/ubuntu/bug-1633220-dovecot

If with your setup that triggers the issue, you could confirm that this fixes it it would help me to go on with that and then also prep the backport work for the older releases.