If your Mother's birthday is tomorrow and you frantically fill out the card, getting all the kids to sign their own name and walk to the mailbox with plenty of time to spare......the mailman will have already come, an hour early.
If you email the person you bought books from, through Cathswap, early in the morning wondering where your stuff is, the mailman will deliver the items that day making you look impatient and maybe even a bit irritating.
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