I too did not receive an emailed receipt for a puchased flight. I downloaded a pdf and requested an emailed recept, both from my receipt list that was acessed through My Trips. The boooking was ticketed properly and all looks good. The purchase was made on Sept 26 and as of today, 12 days later, the email still has not arrived (and is not in the junk folder). All other Delta emails -- schedule changes, promotions, etc.-- have been comethin through fine.