Mail to nonexistent user report

[akaplan]

For most, but not all, of my domains under MAIL SETTINGS

"Mail to nonexistent user" is set to "reject"

How do I get a list of domains that have enabled "forward to address"

My server is getting hit by dictionary attacks and need to disable these accounts.

TIA

 

[unika]

The information are stoted in Plesk database.
Just simple SQL request:

select * from Parameters where parameter='nonexist_mail';