Weighing my options...

I am drafting a letter to invite my sister-in-law to attend our son's wedding, and for some reason, after having written the bulk of the thing, am dwelling entirely too long on the greeting.

The standard, ordinary way to address an invitation like this (which will be seen by Embassy staff) is "To whom it may concern."

Why, then, do I want to put down "To all before whom these presents shall come - greeting"?

I've got the latter in the text right now, but I'll likely chicken out and use the namby-pamby formula.

Cheers...