Other questions

I've had no luck seeking support for this issue on behalf of our clients that are affected, so we have provided them with an explanation on what the issue is along with supporting information, and recommended that they raise the issue with Quickbooks Support directly.

This isn't a scalable solution by any means and those that have raised the issue with support report back that "...Quickbooks took a look and couldn't find any issues" or have misunderstood the issue entirely.

Just re-checking the status of the sending IPs and as expected, they've been added to additional RBL databases...

• 6 additional black-listings for 167.89.82.160 since my previous post.

• 9 additional black-listings for 167.89.58.138 since my previous post.