Haren says Azure inboxes are getting cooked
The $1 mailbox sits inside someone else's tenant, and Microsoft punishes the whole tenant at once.
Taylor Haren says he is seeing a lot of people on X and LinkedIn report that their Azure inboxes are failing right now, with some claiming up to 30% of their inboxes can no longer deliver. He is relaying other operators' reports rather than publishing his own audit, so the 30% figure is hearsay until you check your own Azure-sourced inboxes.
His explanation is tenant risk. Haren's account of how the market got here is that most senders used to set up their own Google Workspace inboxes at around $7 a month, which meant owning the domains, setting up DNS and managing the accounts. Then resellers found ways to sell Azure inboxes for roughly $1 each and everybody took the deal because the math looked good.
What you actually bought for a dollar
What you were not buying, by his description, was a $1 Microsoft 365 license. You were buying a mailbox inside a tenant somebody else controls, next to other people sending cold email, with no control over the licensing or over who else is burning the reputation of that tenant.
"when Microsoft decides the tenant is doing something it doesn't like, it's not your one mailbox that gets punished. Everybody inside the tenant gets hit at once."
That is the part worth checking against your own setup. If your inboxes came from a reseller at a price that only works because the license is shared, your deliverability is tied to strangers you cannot see or stop.
Haren says he got hit too
Haren does not position himself outside this. He says he saw it coming because he had already watched the same thing happen with Google's legacy panels, then adds that he fails as much as anybody else. His number is that he lost 49% of his inboxes in one day and about $31k of infrastructure with it. He does not say in the post which provider those inboxes came from or when the loss happened.
His cost argument is that the savings do not survive the event. Money saved on inbox cost gets spent twice over rebuilding campaigns, replacing domains, recovering replies, and explaining to clients why pipeline stopped. He says that is why his team stopped hunting the cheapest possible inboxes and moved to Halo, which is a vendor he names and is now using, so weigh the recommendation accordingly.
For people sending, the practical move today is not to pick a side in the Azure argument but to find out whose tenant your inboxes live in, and whether a provider decision you have no visibility into can take half your sending capacity out in an afternoon.
when Microsoft decides the tenant is doing something it doesn’t like, it’s not your one mailbox that gets punished. Everybody inside the tenant gets hit at once.
We lost 49% of our inboxes in one day and about $31k of infrastructure with it.
Know what is landing before you burn another domain
One email a day. Under three minutes. What the operators found out yesterday.