I am back to the Community! So, I have been working lately on a revamp of this project, and instead of using the pflogsumm, which wasn't that efficient, now I am using the official Telegraf output for postfix and OpenLDAP, this is the new result:

And here you can find the Github project, really simple to set up all:
Please try it and let me know if I should tweak something, my MTA is not that busy. I have tried this with the latest ZCS 8.8.15 and no problems at all.
Thank you!