That's a great question as we know how important it is for your contacts to receive your emails! When valid email addresses bounce, it's important to remember that Constant Contact bases this information on response codes from the receiving email server. An email address that bounces repeatedly as Non-existent can get marked as Suspended.
The first step is to verify that the email addresses are correct. The next step is to help your contacts "unblock" your emails. We call this whitelisting. The final step is to let us know when the whitelisting has been completed so that we may release the email addresses (otherwise they will continue to bounce and end up as Suspended again).
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