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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