I did not know where to post this, but TechSoup has [another] article about e-mail best practices.  While the opt out part is easy to do, I was wondering how many of us do ask for consent before sending out newsletter to recipients? 

"Always obtain consent before you start sending newsletters to people on your subscriber list. While the CAN-SPAM Act requires senders to include an "opt-out" option that allows receivers to unsubscribe from your list, "opt-in" is the most effective way to build a good relationship with your supporters, says Pease. " 

At the time we started to have e-mail version of our newsletter, we had already accumulated several hundreds of e-mail.  And there is no way my event coordinators will let me put "Do you want to receive Publication #1, #2 or #3" on invitations, event registration forms, etc. - that would take to much space from a design point of view. 

 But we might be an isolated case.