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To add Guardian Mail. Edit your sendmail.mc file (usually found in /etc/mail) and add the following: 
FEATURE(`dnsbl',`<APIKEY>.combined.mail.abusix.zone',`"554 Rejected " $&{client_addr} " is listed by Guardian Mail see http://abusix.ai/search?q="$&{client_addr}')dnl
Replace <APIKEY> with “Your API key” from your account in app.abusix.com. Compile sendmail.mc by running “make” in the same directory and then restart the Sendmail daemon.