Here at Constant Contact, we are an industry leader in email delivery. This is no accident. All of our Terms and Conditions are designed to ensure the best possible delivery rate. That being said, it’s expected that most email campaigns will have some level of bounces. Knowing the cause and reasons behind these bounces can help you as a marketer to ensure you are mailing to the cleanest, most engaged list that you can.
When Constant Contact sends an email to a recipient, but the receiving server can not be found or connected to, the email will bounce as Undeliverable.
For Example: If someone were to send an email to my address, let's say it's email@example.com; however, at that time the receiving server, in this case it would be example.com, is not responding. The email will bounce as Undeliverable as a result (usually after multiple automated resend attempts).
Not at all! A Non-Existent bounce occurs when we connect to the receiving server, but they can not find the address we are trying to send to.
With Undeliverable bounces, that initial connection can’t even be made.
If you look at the reporting for a specific campaign, click on the number of bounces you have. Then select “Undeliverable” or “Blocked” from the “All Types” drop down.
In the case of Undeliverable bounces, it’s acceptable to try sending to the addresses again after a few hours, just in case it is a temporary issue. If they continually bounce, then we recommend moving them to unsubscribe.
Blocked bounces sometimes take a bit of work to diagnose. First, check the “Email Delivery” row at https://status.constantcontact.com to see if there are any known issues. If that doesn’t help, then please contact our Support Team to troubleshoot.
We hope this article was helpful in case the issue ever arises. If you need assistance with any of the above, feel free to post our on Get Help board.