n. A prayer, especially one said while kneeling.
2002
Sign spotted outside the Church of Christ in Mountlake Terrace: "God Answers Knee-mail."
2000 (earliest)
There was a sign by a church. It said, "God Answers Knee Mail." That's because some people kneel when they pray.
As the citations testify, this play on email appears most often on signs outside of churches.