Something heaven-sent comes at exactly the right time, as if a kind power sent it to help you. A heaven-sent chance, a heaven-sent taxi in the rain, a heaven-sent quiet hour when you were at the end of your strength. It is more than lucky: it feels well timed in a way that makes people grateful, even a bit amazed. You will hear it in warm talk and in stories; it is a little old-fashioned for a business email. Though actually, it does not always talk about God. Plenty of people who never think about heaven still say heaven-sent when help arrives just when they needed it.