handling spam

[Maarten]

I don't know much about dealing with spam, what's the best way to deal with spam messages like these coming through?
Make custom spamassassin rules or some other way?

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Message-ID: <owresyb45741880.41288061 at mail.zimerton.biz.ua>
Reply-To: "BTC Investor" <owresyb at zimerton.biz.ua>
From: "BTC Investor" <owresyb at zimerton.biz.ua>
To: <mailinglists at feedmebits.nl>
Subject: Invest in a brighter future today
Date: Wed, 22 Aug 2018 23:20:31 +0300

What are good starting points to start reading up on when it comes
to dealing and handling spam and what would be a good place to start
reading?  https://wiki.apache.org/spamassassin or other recommendations?

Regards,

Maarten