There is a script called pflogsumm ( http://jimsun.linxnet.com/postfix_contrib.html ) who is able to collect everyday Postfix’s statistics.
Those stats can be sent to a mail address, to keep an eye on what is doing your mail server.
I think It’s really useful and interesting, you can read it quickly if there’s a shit somewhere (soo many mails pending… waiting to deliver… relaying spam?.. etc.).
If I’m not wrong, only cron is needed to launch this perl script, to read a log generated by Postfix.
May be this feature can be added to every admin who want to receive everyday stats from the server ? And I think it will be easy to integrate it to Yunohost ?
I’ve got it running really fast on a RPi with ~50 mails/day
To see a report : 1st example found at random on the web : https://calomel.org/pflogsumm.html
Thx for reading
I hope it can be interesting!!