You can only email subscribers with SevenCube, if you obtained their permission in any of the following ways.

They opted in via your web site

This could either be through a newsletter subscribe form or by ticking a checkbox on another form. This checkbox cannot be checked by default and it must clearly explain that checking it will mean you will be contacting them by email.

They completed an offline form and indicated they wanted to be emailed

If someone completes an offline form like a survey or enters a competition, you can only contact them if it was explained to them that they would be contacted by email AND they ticked a box indicating they would like to be contacted.

They gave you their business card

If someone gives you their business card and you have explained to them that you will be in touch by email, you can contact them. If they dropped their business card in a fishbowl at a trade show, there must be a sign indicating they will be contacted by email.

They purchased something off you in the last 2 years

By making a purchase from you they have provided their permission implicitly. Feel free to email them but at the same time, we think it's always better to ask anyway, so why not include an opt-in checkbox as part of the checkout process.