I don’t mind being contacted by email by a program, but I do mind receiving vague emails from programs that say things like, “I want to buy all your traffic. Please reply if you’re interested.” or “I want to discuss a business arrangement with you.”
If you’re going to email me about your affiliate program, you should include all of your pertinent details. Like the names of the casinos, the software they operate on, the CPA and/or revshare that you’re offering, etc. Affiliate recruiters who don’t send details when they email me just get their emails deleted.