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top sender "nouser@nodomain"

hi guys,
 
just updated an old v6 to v7.501.
 
in the email sec stats I see 38 mails from "nouser@nodomain" in the last 2 hours. 
I searched the smtp.log but I don't find anything when searching for that string.
 
any ideas?
 
regards,
 
gnjb


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