The number one reason we see people get blocked is because they have a bad mailing list. Don’t purchase your list or scrape websites for emails. It’s the easy way out and you will pay the consequences. Most of these lists have bad email addresses and include spam traps. ESPs are very good at recognizing bad mailing lists.
You should only send emails to people that have opted in to receiving your emails on YOUR website. In addition, you should be sending a verification email with a link that confirms their subscription (double opt-in) to make sure their email address is correct and that they are the person that signed up. If everyone did this, the world would be a better place.
While we have to rely on you to be responsible about how you procure your mailing list, we do track and give you data to easily see how your emails are being received. We give you information for bounces, unsubscribes, complaints, opens and clicks so that you can modify your mailing lists appropriately. In addition, we automate a lot of the work by keeping track of recipients that have unsubscribed, bounced or complained and stopping future deliveries to those recipients. We give you various levels of unsubscribe granularity so your recipients can unsubscribe to all emails from the domain, just that mailing list or just emails with that “tag” (which you define).