doveadm penalty: who is 0.0.0.0?

[Ralf Hildebrandt]

* Peer Heinlein <p.heinlein at heinlein-support.de>:
> 
> Using doveadm penalty I just noticed a penalty for 0.0.0.0.
> 
> Is this Postfix querying the auth-socket for his SASL-requests?

Maybe a portscan? Sometimes they turn up as 0.0.0.0

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