[Zeke]

If you don't want to take the time to separate the addresses and other info and shred what only needs to be shredded, get the biggest baddest cross shredder you can. Otherwise you will kill a little shredder.

I open every envelope as opposed to dropping in a full one. Occasionally I will get something metallic in one which is a definite killer. I once got a dime in an envelope. That would have fixed the shredder good.

Whole envelopes with pretend plastic cards in them will take your shredder out inside a year.