1) Bounces: These are usually categorized as "hard" and "soft". A hard bounce means a permanent problem with the delivery, such as when you send an email to an address that does not exist. A soft bounce refers to a temporary problem, for example, if the recipient's inbox is full.
2) Content Filtering: The way your newsletter is written, has a major impact on spam filters. After all, we ourselves can identify a Spammer by simply reading the header of the newsletter. Every word that is in your newsletter counts, this is why you should use verification tools to test if you newsletter is considered SPAM. By doing a spam test and making sure you pass it, your content will pass through the most popular filters. Emailbrain offers a spam test you can do before sending your newsletter out.
3) Blacklists: When a message is received from a sender rated on a blacklist (example: those that produce large amounts of spam complaints), they are automatically treated as "junk". Furthermore, whitelists are senders who have earned a reputation for making sends to clean ¨opt –in¨ lists. An incoming mail whitelisted usually enters through all the spam filters as well as testing and sends will be safe. So do not take chances and be sure to use platforms recognized as Whitelisted as Emailbrain, and ensure the success of your campaigns.