That's a great question! The Blocked bounce status means the ISP has decided not to deliver it, probably because it thought the email was spam. The ISP might be concerned about something in the email, or it rejects email from large senders (like Constant Contact). Here's a guide on the other bounce statuses as well as how to manage them.
If you have any additional questions, please let us know.
Hi @MarieG6 ,
Great question! We have an ISP relations team that works with providers and help resolve any issues that might be contributing to an ISP blocking all Constant Contact mail. ISP's can also block an email based on the content of the message, so you may see some blocks for one email campaign and not another.