How to tell if you’re on a blocklist

It’s possible that you have landed on an ISP blocklist if you’re seeing a large number of soft bounces (anything over 5-10%) over an extended period of time.


Do not panic. Delivery issues are (unfortunately) a normal part of the email marketing industry. You will not be blocked forever. The most common blocking issues are due to list management issues.


What to do if you think you are being blocked.


Step 1: Email us

We know how to work with the major ISPs to address delivery issues. Let us know if you think there’s a problem and we can get in touch with them on your behalf.


Step 2: Help stop this from happening again

Here’s where you come in. If you’ve landed on a blocklist, there are generally four places to start looking for the solution:


List management 99% of the time this is the culprit. Make sure you are removing hard bounces, unsubscribes, and abuse complaints right away (WordFly does this for you). Do not send to hard bounces more than two times. You must maintain a clean list if you want to avoid blocking issues. 
Infrastructure Do you have DKIM set up correctly for your sending domain? ISPs require this important TXT record on your domain to authenticate your mail.
Sending Volume Are you sending 50 emails one day and 2 million the next? ISPs don’t like inconsistent sending volumes. Also, it is extremely important to warm up your sending when you’re a new sender or when you have switched email service providers.
Email Content This isn’t usually a problem nowadays but some content can still cause issues. Stay away from using shortened URLs, invalid URLs, or sending one large image.