Where do you buy Ads in email?
where do you buy ADS in the email of a forum or a service?
I mean ads that are put in the email sent from the administrator to the subscribers in a forum, or a blog, or a service (like gmail as example).
Ads in the email (NOT SOLO ADS i mean) could be quite impressive in opt in results cause they are sent to a list of people who are actively involved in a service or a forum