Server has a C: and an E:.  C: is 100 GB  and E:  is 8 TB.

Smartermail is set up on C:.  New customer account is configured on E:.

Their users are doing a Migration using IMAP protocol.  But instead of filling up the E: drive with all the inbound messages, C: is filling up rapidly.  C:\Smartermail\ImapRetrieval folder is the one growing as fast as the network can fill it.

We checked and double-checked to verify this customer should be on E:

Any ideas WHY and how this can be fixed?