I have a similar issue to Nick's.

Here is my script:

if (email.importance != undefined) {

     if (email.importance.toLowerCase() == "high")

           current.priority = 1;

}


if (email.body.priority != undefined)

     current.priority = email.body.priority;


if (email.body.category != undefined)

   current.category = email.body.category;


if (email.body.sub != undefined)

   current.subcategory = email.body.sub;


if (email.body.desc != undefined)

   current.work_notes = email.body.desc;


if (email.body.impact != undefined)

   current.impact = email.body.impact;


if (email.body.urgency != undefined)

   current.urgency = email.body.urgency;


if (email.body.group != undefined)

   current.assignment_group = email.body.group;


if (email.body.assignee != undefined)

   current.assigned_to = email.body.assignee;


current.insert();


event.state="stop_processing";

Email is:

Subject: [whatever you want it to be]

Content:

 Requestor: Joe User
 Category: Infrastructure
 Sub: Network
 Impact: 1
 Urgency: 1
 Group: Infrastructure
 Assignee: Joleen Technician
 Desc: Critical: node down triggered for Seattle 20th floor Switch 4

I can get the script to interpret/populate everything but the Assignment Group.   Not sure why I can't get that to work...I've looked at assignment rules, dictionary, field settings, business rules.   Anybody have an idea?