The more you can save the user from doing the better - the less they have to think is good LOL However always give them the chance to deselect and opt out.
I would also say that if you are sending out emails to your list of members, then always include an unsubscribe link - or at the very least tell them at the foot of the email, how they can opt out of future emails. That way you can't be accused of spamming them.
