A large number of bounces could indicate a technical problem, that your email campaign is being rejected as spam, or that your mailing list is of low quality.
To better understand your bounces please see this help topic: Understanding bounce types
You should always use a verified sending domain, failure to use sending domains is the most common cause of high bounces, please see: Creating a sending domain
The second most common cause is because your email looks like spam or was reported as spam by one of your subscribers, please see: Avoiding spam filters and other email marketing tips
If you are still not sure what has caused your high bounce rate please open a support ticket for us to investigate, email us [email protected]
