1,452 questions
HI, see this for a possible reason and solution: https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-451-4-7-500-699-asxxx-in-exchange-online
Custom mail server - emails stuck in outgoing (451 4.7.500 Server busy)
![](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(208, 97%, 30%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ED%3C/text%3E%3C/svg%3E)
Dev
20
Reputation points
SMTP error from remote mail server after end of data: 451 4.7.500 Server busy. Please try again later from [176.9.84.87]. (S77719) [AM3PEPF0000A794.eurprd04.prod.outlook.com 2024-02-26T15:21:17.191Z 08DC2D7DC0A655E2] Please update how to get rid of this issue..
Exchange | Exchange Server | Other
Outlook | Windows | Classic Outlook for Windows | For business
9,797 questions
{count} votes
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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(124.80000000000001, 48%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EFF%3C/text%3E%3C/svg%3E)
Faery Fu-MSFT 19,751 Reputation points Moderator2024-02-27T06:02:40.4466667+00:00 Hi @Dev , Is there any update on this thread? Have you tried @Andy David - MVP 's suggestion?
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Dev 20 Reputation points
2024-02-27T08:00:14.8766667+00:00 the issue is still there..
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Accepted answer
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Andy David - MVP 157.8K Reputation points MVP Volunteer Moderator2024-02-26T15:39:36.0566667+00:00