[opensuse] filtering "unknown" email messages

Hi For a while now I have been getting email messages that are blank with regards to from. I would like to filter all such messages to the trash. However, creating a filter with blank captures all mails, while creating a filter with "Unknown" captures nothing. I am using kmail 4.14.9. Here an example of the headers taken from one such email MIME-Version: 1.0 From: Subject: ➤Keep Your Family Insured with Private Medical Insurance Starting as low as £9.99/mo! Does anyone know if a simple solution, please? Thanks Eddie -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org