Postfix - Logging mail size for a certain domain
Hi, I am new to Postfix and humbly need help with logging. I need to be able to derive the total size (meaning the size in MB as opposed to the count or number) of mails a certain domain receives. My idea is this can be done through logging. Is it even possible to log the size of emails to a given domain? If so, how can I accomplish this?
If not, is there any other way to achieve this goal?
Thank you in advanced for the help / direction.
BTW, I am using Postfix on a FreeBSD machine. c: