Many things could cause this issue but I suspect its an issue specific to your server since we haven't had any reports of a similar issues, If you create a ticket with us we can help get this sorted out for you. But as a quick fix you can always login by RDP'ing into the server Smartermail is hosted on since IDS doesn't block the local host, from there you can remove the IDS blocks.
Jeffrey Werner
Software Developer
SmarterTools Inc.
www.smartertools.com