I've a customer with a hosting template including 1GB E-Mail space. As upgrade I have an additional template where I specified +4GB E-Mail space. Total shows 5GB for the customer which is fine. Now I've assigned 4GB mail space and it shows that 100% of 5GB are used? To test I've tried to set the first account from 512 to 511 MB space, then I get this message: "Der maximale Speicherplatz für Ihr E-Mail-Konto wurde erreicht. Der maximal verfügbare Speicher in MB ist: -3840" (Quota limit reached. Available mail space is -3840MB) ISPConfig 3.3.1p1 Ubuntu 22.04
Okay, my mistake - just found out the the last two lines have 1,5GB instead of 1… so this is a rounding issue. But the issue with the negative available space still exists.