Seeing rate limiting deferrals at Microsoft OLC (Outlook Consumer/Hotmail) domains?
Specifically with this error message: 451 4.7.650 The mail server [IP Address] has been temporarily rate limited due to IP reputation. For e-mail delivery information, see https://aka.ms/postmaster (S775)
If so, it might not just be you. Many email senders are reporting issues as of late, and Microsoft has updated their email sender support request form with this note: “We are aware of an issue that may result in certain IP addresses being temporarily rejected at higher rates. We are actively investigating the issue. Please continue to submit tickets if you are experiencing this problem.”
Thus, per their recommendation, do continue to submit a ticket if you’re having trouble delivering mail, if you're seeing what seems to be unexpected reputation-related rate limiting when sending to Microsoft-hosted mailboxes.
I’m not sure if this is only specific to error code S775, so that’s a question I can’t answer at the moment.
Seeing rate limiting deferrals at Microsoft OLC (Outlook Consumer/Hotmail) domains?
Specifically with this error message: 451 4.7.650 The mail server [IP Address] has been temporarily rate limited due to IP reputation. For e-mail delivery information, see https://aka.ms/postmaster (S775)
If so, it might not just be you. Many email senders are reporting issues as of late, and Microsoft has updated their email sender support request form with this note: “We are aware of an issue that may result in certain IP addresses being temporarily rejected at higher rates. We are actively investigating the issue. Please continue to submit tickets if you are experiencing this problem.”
Thus, per their recommendation, do continue to submit a ticket if you’re having trouble delivering mail, if you're seeing what seems to be unexpected reputation-related rate limiting when sending to Microsoft-hosted mailboxes.
I’m not sure if this is only specific to error code S775, so that’s a question I can’t answer at the moment.
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