Exchange Server 2003, Small Business Server.
3 email accounts which forward their mail to public folders shared by 3 users.
For ease of reference I'll call the email accounts A, B and C.
and the public Folders A1, B1, C1.
Scans from large bulk scanners are sent to their respective email accounts, which then forward the mail into the public folders. Scan of X-ray of John-Doe's spinal column gets emailed to account A which is forwarded to public folder A1 so three or four doctors can look at it from the comfort of their own office...
Emails without attachments get to all of the email accounts and public folders without issue. Emails with attachments (scans) only get to A1; public folders B1, and C1 get jack for at least 12.5-13 hours.
Mail with attachments can be forwarded from users to the Public folder forwarding accounts (b1 and c1) but attachments that are forwarded automatically through the exchange general tab in AD just aren't getting there in a reasonable amount of time.