Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.
One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.
# ls -ld /var/spool/postfix drwxr-xr-x. 16 root root 4096 Jun 25 06:50 /var/spool/postfix
Oct 3 12:04:49 www01 postfix/sendmail: fatal: chdir /var/spool/postfix: Permission denied
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