Statistics with pflogsumm
To use pflogsumm with the default logging driver, we need to query postfix-mailcow via docker logs and direct the output to pflogsumm:
docker logs --since 24h $(docker ps -qf name=postfix-mailcow) | pflogsumm
The above log output is limited to the last 24 hours.
It is also possible to create a daily pflogsumm report via cron. Create the /etc/cron.d/pflogsumm file with the following content:
SHELL=/bin/bash 59 23 * * * root docker logs --since 24h $(docker ps -qf name=postfix-mailcow) | /usr/sbin/pflogsumm -d today | mail -s "Postfix Report of $(date)" firstname.lastname@example.org
To work, a local postfix must be installed on the server, which relays to the mailcow postfix.
More detailed information can be found in section Post installation tasks -> Local MTA on Dockerhost.
Based on the postfix logs of the last 24 hours, this example then sends a pflogsumm report to email@example.com every day at 23:59:00.