The spam laws are quite ambiguous and seem to differ a lot. I'm curious - what's your opinion (and knowledge of the laws) on including or not including a checkbox specifically for sending newsletters on the trial signup form?

I'd personally argue that it's not necessary as there is now a previous business relationship and you can therefore send marketing emails. Also, if they are signing up for a trial they are expecting to receive information I think. At least I would - that's why I'm signing up - to test the service out and I need info to do it.

Also, wondering if the laws are that different outside the US that you have to include the checkbox even if there is a previous business relationship?