Is this considered spam?

[nohaber]

I am working on an open source forum software (php/mysql). I want the webmaster to be able to email all registered members about new articles etc. Something like integrating a newsletter into the forum.

My question: is the mere fact that a member gives his email when registering, enough to allow the webmaster to email him? or do I need to put some checkbox that says: "I agree to receive emails from ..." upon registration?

[chromate]

I think these days, you either need to expressly say that by registering they agree to receive emails or use a checkbox, as you say. Also, make the emails easy to opt-out of.