Hi @ElizabethW776 ,
Thank you for reaching out! I am looking at your most recent campaign, and I do see what you mean regarding the bounce backs. Nothing that I'm aware of has changed for the bounces to jump up that high, and the fact that they're all listed as blocked instead of other bounce back reasons is interesting.
At this time, I'd probably recommend reaching out to our support team at 866-289-2101 for some live, 1:1 troubleshooting. They should be able to get you in contact with our deliverability team to look further into it.
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