Different types of affiliate promotions have different quality. The best to use is the personalized endorsement. It is a product that you truly do endorse and use, and you can tell your subscribers all about it. Next is product launches. Because so many people use these the launch URLs are more likely to end up on blacklists, do try to using an intermediary page with a personal message from you, and why they should buy the product. Lastly is straight up affiliate promotion from an affiliate network. These are the worst type to use, and many of their URLs are banned from the major ISPs, so the URLs can cause problems with deliverability.