I get emails from Zazzle every single day. They try to sell me everything from throw pillows to smartphone cases. What's frustrating is that I actually had a great experience as a customer, but now I'm just inundated with emails.

I like Zazzle, so I wrote up a bunch of suggestions for their email strategy.

http://www.getvero.com/resources/quality-over-quantity

Edit: Would be awesome to have a strategy section in this community. There aren't many places to chat email.