Still having the same issues, even worse today. Your engineers have been told how to fix it, yet still seem to be avoiding the actual fix.
These are the IPs that have been showing on my email server, (that I am fortunate to be able to log into as I host my own email, and can track delivery)
I just can not see why you are having so many problems with having these IPs taken out of your rotation.
JunkMail rejected - o1.e.notification.intuit.com [167.89.58.138]:45564 is in an RBL: Blocked - see https://www.spamcop.net/bl.shtml?167.89.58.138
JunkMail rejected - o2.e.notification.intuit.com [167.89.58.229]:1674 is in an RBL: Blocked - see https://www.spamcop.net/bl.shtml?167.89.58.229
JunkMail rejected - o4.e.notification.intuit.com [167.89.82.160]:1474 is in an RBL: Blocked - see https://www.spamcop.net/bl.shtml?167.89.82.160
