block illegitimate email
Yahoo needs to block emails that fail authentication checks for legitimate email.
Auth Results: SPF=fail DKIM=unknown DMARC=unknown
The above example should never be allowed to hit my inbox. Fix it or I'm leaving you.
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The best way to get rid of spam is to mark as spam, not delete or block! This helps with your spam filters and does exactly what blocking does, prevents that email from coming to your Inbox. So please keep marking as spam! It is free and part of regular Yahoo Mail. Thanks!