doveadm penalty: who is 0.0.0.0?

[Peer Heinlein]

Using doveadm penalty I just noticed a penalty for 0.0.0.0.

Is this Postfix querying the auth-socket for his SASL-requests?

I tried adding 0.0.0.0 to login_trusted_networks, but that doesn't help.

Peer

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