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Posted to users@spamassassin.apache.org by Vladislav Nikolaev <vl...@abv.bg> on 2025/07/23 10:07:37 UTC

DMARC avoidance

Hello, 
  On
spamassassin-4.0.1 when the e-mail field "From:" contains space DMARC check doesn't work and the spam/phishing emails are not blocked via
DMARC_REJECT rule.  
  Here's an example:  
  The following doesn't trigger the DMARC (note the space between no reply)   From: companyname    
  This works as expected and match DMARC_REJECT
  From: companyname     
  Some of the spam/phishing e-mails start to use this technique to avoid the DMARC.  
  Best Regards,  V.Nikolaev