This is without doubt the best out of office reply I’ve ever received.
I’ll be in Africa until the end of August, with irregular access to e-mail. No doubt I will still neurotically check my messages, but I may only be able to respond to pressing issues. I’ll try to get back to all as soon as possible.
I won’t tell you who it is from but he is a well-known development blogger.
Better examples gratefully received in the comments.