EMAIL ...Spam/Junk Mail Filter Levels

Stage 1. Server pre-checks often include Blacklists/Whitelists, SPF, DKIM

Stage 2. SpamAssassin on each mail account looks at many email properties

Stage 3. Client mail filters (ie Outlook/Thunderbird) ...moving good emails to the inbox trains the filter.

Setup Strategies:
A. Step 2 to only mark and step 3 separate and filter more
B. Step 2 less strict and delete, Step 3 filter more.
C. Step 2 strict

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