I wish postage was less too however the postal rate discounts for huge when we barcode, update addresses and sort mail.

If you can't get a mailing address on there you're stuck with a bunch of cards the postal service won't mail out.In order to find that space I would restructure the first slide, which I assume is the back.

I would like to get an idea about how you handle incoming calls from people responding to postal mailings or other marketing methods.What do you say when someone calls?

You can always take a handful and ask your friendly local postal worker (well, they're friendly in my town, anyway, but it's a small town) and they'll tell probably be able to tell you right away what's going on.

Let's bring this post alive again. 

(I thought I'd get a better postal rate on PCs because my #10s only run $0.265/each but are larger and heavier. 

So if Bandit signs are misleading what about he yellow letter  the yellow letter is just a bandit sign sent through the US postal service..

You should figure out where you are printing this and ask them for guidelines for address and postage block, so you don't create a design and then find out at time to print that you didn't allow space for those things per postal regulations.I agree with @Jeremy T. that you need to present the problem, how it could get worse if not addressed (agitation), and what solution you provide to solve that problem and save the day.  

I wish I had more control of the postal system however I don’t.  

If it was one order, I'd say it was a postal issue but it's multiple orders.