Josep M.:
> Hello.
> 
> Time ago I  was using this for see what  addresses  had "verify_sender"
> feature, is just for my own domain.
> 
> egrep '(Address verification in progress)' /var/log/maillog

This REJECT message is logged only if it takes too long to find out
the address status.

You will have more consistent results with

egrep 'status=(un)?deliverable' /var/log/maillog

        Wietse

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