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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(259.20000000000005, 10%, 35%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESS%3C/text%3E%3C/svg%3E)
Remote Server returned '554 5.4.0 <[hotmail-com.olc.protection.outlook.COM] #4.7.650 smtp; 451 4.7.650 The mail server [64.78.33.169] has been temporarily rate limited due to IP reputation. Remote Server returned '554 5.4.0 <[hotmail-com.olc.protection.outlook.COM] #4.7.650 smtp; 451 4.7.650 The mail server [64.78.33.36] has been temporarily rate limited due to IP reputation. Remote Server returned '554 4.7.0 <[live-com.olc.protection.outlook.com] #4.7.650 smtp; 451 4.7.650 The mail server [64.78.33.138] has been temporarily rate limited due to IP reputation.
Moved from Microsoft 365 and Office | Office Online Server
Managing personal Outlook.com account settings, security, and privacy
Remote Server returned '554 5.4.0 <hotmail-com.olc.protection.outlook.COM #4.7.650 smtp; 451 4.7.650 The mail server [64.78.33.169] has been temporarily rate limited due to IP reputation. Remote Server returned '554 5.4.0 <hotmail-com.olc.protection.outlook.COM #4.7.650 smtp; 451 4.7.650 The mail server [64.78.33.36] has been temporarily rate limited due to IP reputation. Remote Server returned '554 4.7.0 <live-com.olc.protection.outlook.com #4.7.650 smtp; 451 4.7.650 The mail server [64.78.33.138] has been temporarily rate limited due to IP reputation. Remote Server returned '554 4.7.0 <live-com.olc.protection.outlook.com #451 4.7.650 smtp; 451 4.7.650 The mail server [64.78.48.238] has been temporarily rate limited due to IP reputation. The latest report has that node blocked already: Remote Server returned '554 5.4.0 <hotmail-com.olc.protection.outlook.com #4.0.0 smtp; 403 5.7.1 Unfortunately, messages from [64.78.33.38] weren't sent.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(134.4, 56.00000000000001%, 23%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EB%3C/text%3E%3C/svg%3E)
This error indicates Outlook/Hotmail has temporarily rate-limited your server due to IP reputation. Reduce sending volume, pause bulk emails, and ensure proper SPF, DKIM, and DMARC setup. Check blacklists and request delisting if needed—delivery usually recovers once reputation improves.
Still we are facing error, kindly do whitelist below IP also,
64.78.49.5
52.101.42.11
Relay : outlook-com.olc.protection.outlook.com[52.101.42.11]:25 MessageID : ******@amcorprop.com Status : deferred (host outlook-com.olc.protection.outlook.com[52.101.42.11] said: 451 4.7.650 The mail server [64.78.32.93] has been temporarily rate
Dear Team,
Kindly do whitelist below IPs, still getting error please take look, asap,
64.78.33.169
64.78.33.36
64.78.33.138
64.78.48.238
64.78.33.38
64.78.49.5
52.101.42.11
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(60.8, 72%, 15%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ERW%3C/text%3E%3C/svg%3E)
we are receiving this email as well today. we use Office365 and trying to email hotmail.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(252.8, 27%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EC%3C/text%3E%3C/svg%3E)
Tengo el mismo problema hace un par de días
Remote Server returned '554 5.4.0 < #4.7.650 smtp; 451 4.7.650 The mail server [190.221.62.40] has been temporarily rate limited due to IP reputation. For e-mail delivery information, see https://aka.ms/postmaster (S775) [Name=Protocol Filter Agent][AGT=PFA][MxId=11BCF3710BA766E0] [BL6PEPF00022573.namprd02.prod.outlook.com 2026-03-04T08:59:57.061Z 08DE79B885E34A9C]>'
Remote Server returned '554 5.4.0 < #4.7.650 smtp; 451 4.7.650 The mail server [190.221.62.41] has been temporarily rate limited due to IP reputation. For e-mail delivery information, see https://aka.ms/postmaster (S775) [Name=Protocol Filter Agent][AGT=PFA][MxId=11BCF3710BA766E0] [BL6PEPF00022573.namprd02.prod.outlook.com 2026-03-04T08:59:57.061Z 08DE79B885E34A9C]>'
Las IPS 190.221.62.40 y 190.221.62.41 no están en una blacklist
Por favor solicito que las agreguen en la lista blanca
190.221.62.40
190.221.62.41
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(252.8, 84%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ES%3C/text%3E%3C/svg%3E)
https://www.ipreputationdeez.com/
at least a decade of this horrid stuff.. whoever devised ip reputation is pure evil and against internet etiquette - last time i looked it wasnt microsoft that invented email.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(89.60000000000001, 72%, 18%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESI%3C/text%3E%3C/svg%3E)
Hi,
If you are a sender of the Email and the recievers are getting this message(the Question is not clear I'm afraid), consider filing the request form at https://sender.office.com.
If this is a custom domain email account, cCan you ensure if you have added the SPF and DKIM records in the Domain DNS?