When do you use each of these?
Here’s my sentence:
Should I use Each or Every?
Don’t give yourself unnecessary problems.
The monthly newsletter brings you delicious recipes etc…
Each to his or her own. Every time. 
Yes.
Either is correct, I think. I would say to use “each” when you wish to emphasise distinctness:
“Each month the newsletter brings you new recipies, articles, and fun facts.”
Use “every” if you wish to emphasize regularity:
“The newsletter is delivered every month, without fail.”
If you don’t care about the emphasis, use whichever you like best.
General agreement with the previous posts, with one caveat: I would only use “each” if the monthly newsletter in question is indeed published 12 months out of the year. If the newsletter in question has combined June/July summer-celebration or November/December holiday-bonanza isses, use “every” instead of “each.”
“Each” implies partial fulfillment toward a whole, which “every” does not. If you aren’t publishing a newsletter every month, then there isn’t one for each month.
For what it’s worth. 