Ipswitch IMail contains a flaw withing the web messaging functionality that may allow a remote denial of service. The issue is triggered when a a user creates a specially crafted email with an overly long 'To:' field, and will result in loss of availability for the server.
Remote / Network Access
Denial of Service
Loss of Availability
Upgrade to version 8.13 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.