Use python programming language to build a simple email scraper to build your email list for free. You can get thousands of free valid email accounts. You can use this simple but powerful python script to get more leads for affiliate marketing and cold emails. This script is 100% free but trust me when i say that email scraper like are usually pricy. Therefore, this is great opportunity to get a lot of free email accounts for your online business or start your business online for free. You can find this script here:
If you need more help, you can comment under this post. I would do my best to help with that.