packages with invalid maintainer fields
Debian maintainers are required to provide a valid email address in
the maintainer field for package uploads. Some maintainers have
adopted the policy of various arbitrary filtering rules of their own
invention, under which they will not receive some proper email from
perfectly legitimate senders communicating about their packages.
I believe such packages should be treated exactly as if the developer
in question has simply put no email address at all in the package.