How to clear mail log on FreeBSD

To clear log, there is several ways that can be done.

1st : 

/var/log/mail.log

Below is the command where we will use cat to overwrite log with null value.

cat /dev/null > /path/to/logfile

How to clear all log in one directory.

This command will overwrite all log in the directory of /var/log with null value

for i in /var/log/*; do cat /dev/null > $i; done

If you have any problem, can ask in the comment section below.