Products: IMail Server Plus, IMail Server Premium, IMail Server

How to Block Messages with No Subject

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I am getting a lot of spam that has no subject line or a blank subject.  How can I delete these messages.
Create an inbound rule as follows:

H!~Subject\: (\w|\S)*:NUL

This searches the Header to see if there is a Subject: line and that it contains any word characters or any non-white space, if not, delete it.
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