We have a mailbox that in the past month has grown from >2gb to over 33gb. The number of total items in the mailbox has grown normally. It seems like one day a week the mailbox size increases and I get multiple transaction logs per minute. Looking at the mailbox I'm not finding large emails that would account for this size mailbox.
I've scanned for viruses and found nothing. I also archived older emails which reduced the number of items in the mailbox but the size only shrank about 500mb.
Any ideas on what could be causing this mailbox to grow?