mailchk
cPanel mail checker CLI by Heston Hamilton
Installation instructions:
git clone https://github.com/TheGingeraffe/mail_checker
cd ./mail_checker
./mailchk
Usage:
mailchk $command [domain(s)]
Commands:
\* Help
-(d)ns NS/MX/SPF/DKIM/DMARC check
-(b)reakdown Storage breakdown
-(i)ntegrity Shadow/passwd/maildir checks