What would getting a P.O. box change?? I meet my mailman at 4:30-5:00 pm every day and it's still baking hot, I wasn't saying that it sits in my mailbox for 8 hours. It's hot right off the truck, and hot on every other truck it's been on before it gets in my hands. And even if I did get a P.O. box, aren't they just more secure/safer?
If your PO Box is in the post office, your liquid wouldn't spend the day in the hot truck. It would arrive at your local post office and be popped in your box.
Anyway, I assume it's like milk deliveries. Milk is delivered to my grocery store in a refrigerated truck. When it gets there, cases of it are taken out and put on the sidewalk. Then they figure out which cases are going into this grocery store and those are put on a hand cart. Then the store manager comes out and they check the invoice. Once that is done, the cases that aren't for this store are put back in the truck and the others are wheeled over to the dairy section. They are taken off the hand cart and left in front of the refrigerated case for half an hour or so before they are put in. Finally I, the shopper, pick up a bottle and put it in my non-refrigerated cart. I wander around the store for a while, completing my shopping. Then I check out, take it home and put it in the fridge.
In an ideal world, milk is refrigerated from the moment it pasteurized until it is poured into my coffee. Yet somehow it's always fine at least until the date on the bottle.
In an ideal world, e-liquid would be in a dark, non-humid 60 degree container from the moment Tasty Vapor makes it until you vape it. Fortunately there seems to be some wiggle room and it can withstand quite a few hours being hot.