Daniel Lange <DLange@debian.org> writes:
We have more people registered for DebConf ("the Debian Developers'
conference") with @gmail.com than @debian.org addresses.
You can't fix @gmail.com. It is deliberately broken for commercial
reasons, and that won't stop with SPF and DKIM. Anti-spam is just the
current selling excuse for moving users to a closed, commercially
controlled, messaging service.
Document that @gmail.com doesn't work and ask anyone subscribed with
such an address to resubscribe using an Internet email service.
You might want to make a press announcement out of it, to prevent other
service providers from making the same mistake Google has made.