(This is part of an actual email forwarded to me; fortunately I wasn't on vacation or I may have received it twice also!!)
"GreetingsI believe when I sent this to you *****, you were on vacation.
Hope you had a nice Christmas / New Year break.
Wanted to remind you of this event forthcoming.
So of course, they re-sent the email because it would most likely mysteriously disappear while ***** was on vacation instead of just sitting there in his inbox until he came back to work...sort of the way some people leave you their phone number twice in a voice mail, just in case you don't feel like playing it over if you missed the phone number the first time...