Install isoqlog by entering the following commands in the terminal:
sudo apt update sudo apt install isoqlog
Description:
Mail Transport Agent log analysis program
Isoqlog is an MTA log analysis program written in C. It designed to scan qmail, postfix, sendmail logfile and produce usage statistics in HTML format for viewing through a browser. It produces Top domains output according to Sender, Receiver, Total mails and bytes; it keeps your main domain mail statistics with regard to Days Top Domain, Top Users values for per day, per month and years.
Homepage: http://www.enderunix.org/isoqlog/
Version: 2.2.1-9build1
Section: universe/mail