I always just call them. When I'm working on routes, I normally am working on something for next week, so I can't wait 2 or 3 days for a response.
On the phone, they are SO helpful. They'll just tell you "No, we are not offering incentives at this time. Do you want us to call you when we do?"
Heck, yes.
And I have some very very funny stories about Maritz....but can't share them without violating ICA, darn it!