Daniel Lange <dla...@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. Bjørn