In Entireweb website in FAQ section they mentioned that including the affiliate link in spam emails will lead to account suspension.

"You may NOT use the Entireweb affiliate program to refer yourself to the Free Search Engine Submission service. The banners and the links of the affiliate program may NOT be used in spam emails or other spam activities (blog comment spam, forum spam, etc.). In that case, your affiliate account will be terminated and outstanding commissions will not be paid."