Issues with deliverability to hotmail -- any Microsoft contacts?

We have been having issues delivering email to hotmail users again, no bulk mail, just various personal emails from a server on our network. We have signed up for SNDS, only identified one mail server of a customer on our network that was flagged as an issue, and it has been remedied, no longer showing in SNDS.

We have repeatedly requested removal of our subnet from their block list and it has not worked. MS has done a great job of making it impossible to contact anyone about this. Does anyone have pointers on what else can be done or whom we should contact to get this resolved?

Thanks,
–Brock

Have you used this form? I feel your pain.

https://support.microsoft.com/en-us/supportrequestform/8ad563e3-288e-2a61-8122-3ba03d6b8d75

Many times. I get a weird auto-response after a couple days that doesn’t make any sense and then nothing else happens.

We have been having issues delivering email to [...]

You should probably join the mailop list.

We have repeatedly requested removal of our subnet from their block list
and it has not worked.

You will eventually be conversing with a person if you persist responding to the ticket that you opened via the web though initially you are not and it might not seem so even after -- do not open multiple tickets for the same address/block.

/mark