What you can do is put in your sendmail access
connect:mailchimp.com ERROR "SPAM" This refuses any connection of ip addresses with a reverse lookup having *.mailchimp.com -----Original Message----- Sent: 11 March 2020 00:15 To: users@spamassassin.apache.org Subject: How to block chimpmail emails? I receive several marking emails from chimpmail. I've tried adding the from email address to the blackfrom_list, but that does not block chimpmail. How can a person block these? Thank you. Daryl