We have in around 100 users on a single exchange server setup. Transport, Mailbox, Client access is all one server. Over the weekend our data drive containing the Exchange installation and databases, and the system page file got full. We grew the disk and
turned on circular logging to create some space.
Now though the space is getting consumed at around 3GB/day. We have various scripts that send emails to the SMTP connector, I was wondering if one of those was behaving erratically. But i ran the email stats script from here: http://gallery.technet.microsoft.com/scriptcenter/bb94b422-eb9e-4c53-a454-f7da6ddfb5d6
and the received totals doesn't account for anywhere near 3gb of data.
I wrote down the sizes of the mailbox and public folder database folders. In a few hours I can check if those are growing.
In the mean time, looking for other suggestions to find the source of the problem.