Hi everyone.
For the past eleven (11) months I have been trying to resolve a very poor inbox delivery rate into Hotmail. We are an ESP and work only with top-tier clients yet Hotmail is stating that the "majority of the IP's are considered by SmartScreen as sending spam" (when in fact it's 100% confirmed opt-in, zero spam, but I understand smartscreen so that doesn't matter.) The problem is, hotmail, per policy, refuses to provide even a shred of a hint as to where the reputation data is coming from. We've checked our IP's on against every blacklist on the planet along with every possible RHS blacklist/domain blacklist, greylist, etc. Nothing appears. Eleven months of searching for an answer, daily, brings me to the next possible area: Brightmail.
What brings me to the Brightmail area is that several years ago I recall there was a connection between Hotmail and Brightmail where hotmail incorporated some of the Brightmail technology into their smartscreen system. I'm checking to see if there are any humans at Brightmail that are willing to go out on a limb and offer some assistance to see if some of our IP's or client domains are in their GBL or other database that may be causing Hotmail to junk just about everything, even mail from the local Church to their members, and mail from m.o.m.s to their son's overseas in Afghanistan.
If this is not the correct area to post this message in - my apologies. I've pulled every rabbit out of every known at to try and figure this out and all the rabbits come up empty. Any ideas would be welcome.
Thanks
John