Hi,

astroidmail can't currently be built in unstable. It's BD-Uninstallable
on all architectures because it build-depends on libboost-system-dev,
which boost-defaults no longer provides:

https://buildd.debian.org/status/package.php?p=astroidmail&suite=sid
  (unsatisfied dependency on libboost-system-dev)

Boost.System has been header-only for a long time and astroidmail doesn't
use it. The CMake find_package(Boost ...) call only asks for filesystem,
program_options, log_setup, log, thread and date_time. No source file
references boost/system or boost_system.

Dropping the build-dependency is enough. I built the package with the
patch below on Ubuntu stonking (Boost 1.90), and all 18 tests pass.

Thanks,
Sebastien Bacher