Alberto Bertogli cfe0e48c0a auth: Allow users without a domain ...

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.

2021-06-11 20:09:15 +01:00

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