[Assp-user] Check specific header for content

[Farokh <fa...@be...>]

Is there a way to test for specific content in a particular header?

I'm seeing a lot of spam with the following header:

List-Unsubscribe: <https://cl.s13.exct.net/subscription_center.aspx?...

and I'd like to block it based on that.

Thanks.

-- 
Farokh
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