[OS X TeX] envelopes and mutlple letters

[Google Kreme]

Before I set about doing this by hand, or worse, with Word, I figured
I would check here.

I need to send out about 30 copies of a letter

I could write a short PHP to take the initial tex file, add the
appropriate info to each, and then save a new .tex file, one per
letter.  This seems rather inefficient however, and could be down
right unwieldy if I had, for example, 300 or 3000 letters to process. 
It seems that a single document containing all the letters would be
better, yes?  Before I roll-my-own, is there something already out
there?

I would also, of course, like to print envelopes.  It looks like
envelope support is limited to envelopes with windows.  Since I am
working on a Holiday letter, windowed envelopes are not appropriate.


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