Thank you for reaching out to the Constant Contact Community. It's my pleasure to assist you today.
I'm sorry that you had such a large number of bounces for the Other Bounce Type. If these were all from the same domain, generally the issue can be resolved by Whitelisting Constant Contact so your firewall recognizes it's a safe address. If you try these things and continue to have issues, please feel free to reach back out.
Thank you for choosing Constant Contact. Have a great day!
... View more