I have had two customers ask me about sunday delivery in the last 48 hours so I have been thinking about it. The people both referred to check boxes on the form so I'd think they mean the USPS express form. The express form has a "weekend" check box under "no delivery" so I'm thinking that the people must be confusing "delivery" and "no delivery", and also "weekend" vs "sunday" but that's a pretty far stretch. One of the customers claimed that there was special black and yellow tape that they put on the envelope. USPS's site does specify it is possible though: "Express Mail service offers delivery 365 days a year with no Saturday delivery charges, residential surcharges, or fuel surcharges. Sunday and holiday delivery is available to many ZIP Codes for a modest premium." Does anybody know how to pay for this service and if it can be done without interacting with a clerk? Nod