Block null senders

[virmix]

New Rule or Block System.

When sender try more of 4 times (in 72h) send email with null senders block IP and EHLO

[dcol]

I know this post is old, but I have a suggestion to block NULL senders without affecting Mailenable local messages.

Create new Message Manager Filter using the following

Name of Filter: Block NULL
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Critera script

FilterResult = 0

' Check if the IP is intenal
If CriteriaMet([ME_IPADDRESS], "127.0.0.1") Then
FilterResult = 0

' Check if the envelope sender is empty (Null Sender)
ElseIf CriteriaMet ([ME_FROM], "<>") OR CriteriaMet ([ME_FROM], "") Then
FilterResult = 1

End If
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Actions

Delete Message
Stop Processing Filters
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You can optionally add actions to forward the message to a special inbox for inspection.
Reply if this works for you.