Hi. I have recently become interested in cool ways to close letters/e-mails. Here is an initial list of some ideas. Please feel free to provide suggestions in the "comment section" of this website.
What in the sam hill,
May the Force be with you,
Live long and prosper,
God save the queen,
As you were,
Most hopeful surprises,
Warm and infectious wishes,
No plan survives first contact with the enemy,
Be that as it may,
Goodbye forever,
To infinity and beyond,
Man proposes, god disposes,
May god have mercy on your soul,
Heaven help us,
