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cfe0e48c0a
Some deployments already have users that authenticate without a domain. Today, we refuse to even consider those, and reject them at parsing time. However, it is a use-case worth supporting, at least with some restrictions that make the complexity manageable. This patch changes the auth package to support authenticating users without an "@domain" part. Those requests will always be directly passed on to the fallback authenticator, if available. The dovecot fallback authenticator can already handle this case just fine.