I just reply to the order confirmation email, I think that is sales@.....
It has the order number in it which I assume is useful to them.
I think I sent 2 emails on this one, got a reply to each rapidly. One explained that it would be time N, the other confirmed that they had gone out the day before (a little late but they had gone).
Package duely arrived - the address was handwritten so I assume that they have some poor Narn being whipped into licking envelopes at Mongoose Hall.