DMARC avoidance

Vladislav Nikolaev <[email protected]> Wed, 23 Jul 2025 13:07:37 +0300 (EEST)

Newsgroups	gmane.mail.spam.spamassassin.general
Message-ID	<[email protected]>

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