Please consider better handling of Soft Bounces that cause recipients to become Blocked.
Despite a KB article that suggests a rolling 90 day period is used when looking for >=4 Soft Bounces (https://support.clickdimensions.com/hc/en-us/articles/115002691253-Unblock-an-Email-Address) this does not appear to be the case. Following a recent support case I've now been told that any 90 day period with >=4 Soft Bounces will result in the recipient being blocked.
Your KB articles also indicate that Soft Bounces are supposed to represent temporary delivery problems not permanent ones yet after >=4 Soft Bounces (in any 90 day period it seems) these are effectively considered permanent and emails to that recipient are never attempted again.
We have accumulated thousands of recipients like these after spates of delivery issues with certain email domains that occured a year ago now.
Please consider either making the period genuinely rolling (>=4 Soft Bounces in the last 90 days) or re-try emails to recipients blocked in this way after a certain period of time has passed (e.g. another 90 days).