Now that you mention it, some emails do seem to just not be getting
through. In the last 17 hours we've successfully delivered 46549 emails
to Microsoft, and we've given up on 3256. And I've noticed new language
via support:
"The connection and throttling limitation against your IP
136.175.108.47
136.175.108.64
136.175.108.0
136.175.108.29
136.175.108.89
136.175.108.130
136.175.108.148
136.175.108.84
has been set to a more appropriate level based on your reputation."
I'm debating adding a /24 to our outbound to see if that clears up the
last stretch, as it seems that either this is a new throttling system or
they're leaning more heavily on an older one than they were just 48
hours ago. If I go through with it, I'll keep you guys posted on whether
or not it clears things up.
On 2026-02-24 10:13, Paul Smith* via mailop wrote:
On 24/02/2026 12:45, Gellner, Oliver via mailop wrote:
We receive the same error messages for all servers since 2026-02-23
18:45 UTC. It's unlikely that Microsoft suddenly received spam from
all IP addresses of all kind of unrelated organizations yesterday
evening. Probably some algorithm went nuts there.
I thought we were being *rate limited*, but we're not, nothing at all
is going out to outlook.com, hotmail.com, etc. Mail to business M365 is
going out fine.
The last one we sent successfully was at 16:42 UTC yesterday
hotmail-com.olc.protection.outlook.com | 2026-02-23 18:42:59.270101+00
eur.olc.protection.outlook.com | 2026-02-23
18:15:08.699069+00
hotmail-com.olc.protection.outlook.com | 2026-02-23 18:00:08.615426+00
hotmail-com.olc.protection.outlook.com | 2026-02-23 17:59:20.363448+00
eur.olc.protection.outlook.com | 2026-02-23
17:45:34.862099+00
hotmail-com.olc.protection.outlook.com | 2026-02-23 17:45:09.072445+00
outlook-com.olc.protection.outlook.com | 2026-02-23 17:45:05.513997+00
eur.olc.protection.outlook.com | 2026-02-23
17:39:01.241583+00
outlook-com.olc.protection.outlook.com | 2026-02-23 17:37:07.033491+00
hotmail-com.olc.protection.outlook.com | 2026-02-23 17:30:14.199864+00
eur.olc.protection.outlook.com | 2026-02-23
17:30:09.456287+00
I've sent support messages to Microsoft (via
https://olcsupport.office.com/ ), but we get an automated response
saying 'there's no reason you can't send mail to Outlook.com'. I've
sent a follow up email message to hopefully get a human response, but
no replies at all yet
Paul
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