emailed, not posted
It arrives by email, usually within a minute, so there is no chance of it turning up late. Send it to yourself and forward it on if you would rather hand it over.
it never expires
No date on it, no small print, no quietly losing its value. If they forget about it for two years it is still worth exactly what you paid.
works on any drop
Including the seasonal editions, which is the only reliable way to make sure somebody gets one of those — they tend to go before you have decided.