I really liked one from ETH, Zurich. It was a personal letter (i.e. not generated) mentioning that for the particular job they found another person, whose skill

I really liked one from ETH, Zurich. It was a personal letter (i.e. not generated) mentioning that for the particular job they found another person, whose skills were more appropriate at the moment. And the sender asked me to keep an eye for further openings.