We are seeing this error on specific sender IPs. So “Server busy” may be 
intentionally and dependent on the sender. 
There are also many versions of this error, with at least 6 different AS codes. 
Some occur after MAIL FROM, some occur after RCPT TO, and some occur after 
DATA. 

Previously Hotmail said something like “We have limits for how many messages 
can be sent per hour and per day”. Very useful, you knew that reputation was 
the issue.
Now we just see “Server busy” with an internal code, and we have to guess 
what’s wrong. It would be helpful to know more about these AS codes. Or at 
least which ones are sender issues and which ones receiver issues. This will 
also relieve Microsoft support I guess.

Maarten Oelering
Postmastery

> On 3 Nov 2017, at 07:49, Benjamin BILLON via mailop <mailop@mailop.org> wrote:
> 
> Sorry to interrupt, I just have a suggestion that maybe Michael could forward 
> internally: there used to have a Status page for various Microsoft services, 
> it either moved to some secret place or was removed. There's now a page for 
> Office365 clients (however being myself client the page generates an asp 
> error, but that's not the purpose of my message).
> 
> Could there be such a page somewhere again? If there are issues, just being 
> aware of them will already help ESPs and senders to 1) be patient and 2) show 
> to their clients or boss that yes, it happens, ISPs can have outages or 
> problems too.
> I have no idea what format it would take, probably a "working / not working" 
> flag wouldn't be very useful, unless it's service by service (but I don't 
> think MS would disclose such level of details).
> Knowing if it's geographically limited could be interesting to.
> 
> Is it a realistic suggestion, or should I put this dream in the shredder? 
> 
> Cheers, 
> 
> 
> -- 
>  <https://www.splio.com/>
> Benjamin
> 
> 2017-11-03 14:19 GMT+08:00 Emre Üst |euro.message| <emre....@euromsg.com 
> <mailto:emre....@euromsg.com>>:
> Hi Michael,
> 
> Yes we are still seeing same code . 
> 
>     2017-11-03 09:17:02 "451 4.7.500 Server busy. Please try again later from 
> []. (AS3110)" received from hotmail-com.olc.protection.outlook.com 
> <http://hotmail-com.olc.protection.outlook.com/> (104.47.5.33) matching /451 
> 4.7.500 Server busy/
> 
> We cant send even 1000 mails to Hotmail per day . 
> 
> Thank you 
> 
> 
> On Fri, Nov 3, 2017 at 12:13 AM, Michael Wise <michael.w...@microsoft.com 
> <mailto:michael.w...@microsoft.com>> wrote:
>   <>
> This may be related to an incident a few days ago.
> 
> Are you still seeing the 4xx retry results?
> 
>  
> 
> Aloha,
> 
> Michael.
> 
> --
> 
> Michael J Wise
> Microsoft Corporation| Spam Analysis
> 
> "Your Spam Specimen Has Been Processed."
> 
> Got the Junk Mail Reporting Tool 
> <http://www.microsoft.com/en-us/download/details.aspx?id=18275> ?
> 
>  
> 
> From: Emre Üst |euro.message| [mailto:emre....@euromsg.com 
> <mailto:emre....@euromsg.com>] 
> Sent: Thursday, November 2, 2017 1:05 PM
> To: Michael Wise <michael.w...@microsoft.com 
> <mailto:michael.w...@microsoft.com>>
> Cc: mailop@mailop.org <mailto:mailop@mailop.org>
> 
> Subject: Re: [mailop] Hotmail and 4.5.1 4.7.500 Server Busy with some
> 
>  
> 
> Hi Michael , 
> 
> Unfortunately , it doesnt work . Outlook Support team said that there is not 
> blocking on their side . 
> 
> Although the ips are Returnpath certified. Sometimes we also get 421 RP-001 
> (BAY004-MC2F28) errors. But mostly 451 4.7.500 Server busy. Meanwhile, on 
> snds I see that there is a lot of difference between the number of RCPT 
> fields and Message recipientss.
> 
> For Exp.
> 
> 
> RCPT
> commands  111829
> 
>  
> 
> DATA
> commands 106093
> 
>  
> 
> Message
> recipients 1215
> 
>  
> 
> Thank you 
> 
>  
> 
>  
> 
> On Thu, Nov 2, 2017 at 10:18 PM, Michael Wise <michael.w...@microsoft.com 
> <mailto:michael.w...@microsoft.com>> wrote:
> 
>   <>
> Please open a ticket.
> 
>  
> 
>               https://go.microsoft.com/fwlink/?LinkID=614866&clcid 
> <https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgo.microsoft.com%2Ffwlink%2F%3FLinkID%3D614866%26clcid&data=02%7C01%7CMichael.Wise%40microsoft.com%7C2f4782c55b2f40a5ef4208d5222d0ad3%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636452499220192627&sdata=HbSg8Akc%2Bgzia7rHrKlJdRYe39MdC%2BmbpA95OGbvLqo%3D&reserved=0>
>  
> 
> Aloha,
> 
> Michael.
> 
> --
> 
> Michael J Wise
> Microsoft Corporation| Spam Analysis
> 
> "Your Spam Specimen Has Been Processed."
> 
> Got the Junk Mail Reporting Tool 
> <https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.microsoft.com%2Fen-us%2Fdownload%2Fdetails.aspx%3Fid%3D18275&data=02%7C01%7CMichael.Wise%40microsoft.com%7C2f4782c55b2f40a5ef4208d5222d0ad3%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636452499220192627&sdata=wjcH9RyKmDm9pNbnw02s9sUTdWVcaWqtb1m1UiN8Hkg%3D&reserved=0>
>  ?
> 
>  
> 
> From: mailop [mailto:mailop-boun...@mailop.org 
> <mailto:mailop-boun...@mailop.org>] On Behalf Of Emre Üst |euro.message|
> Sent: Wednesday, November 1, 2017 2:20 PM
> To: mailop@mailop.org <mailto:mailop@mailop.org>
> Subject: Re: [mailop] Hotmail and 4.5.1 4.7.500 Server Busy with some
> 
>  
> 
> Hello Michael,
> 
> We have same issues 
> 
> 185.11.213.11;185.11.213.12;185.11.213.13;185.11.213.14;185.11.213.15
> 
> İts kind of like all network blocked .
> 
> Thank you
> 
>  
> 
> 
> -- 
> 
> 
> 
> 
> 
> EMRE ÜST
> 
> Deliverability Specialist
> 
>  
> 
> t.   +902123430739 <tel:(0212)%20343%2007%2039>
> f.   +902123430742 <tel:(0212)%20343%2007%2042>
> 
> email: emre....@euromsg.com <mailto:%23>
> skype: user_name
> web: euromsg.com 
> <https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.euromsg.com%2F%3Futm_source%3Demail-signature%26utm_medium%3Demail&data=02%7C01%7Cmichael.wise%40microsoft.com%7Cba824f4f24874b17466f08d52170646f%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636451689007378293&sdata=OKyqw0qpRZ%2Bk0NczXTteF3haLx%2FJf8eWppnvMiD1XKw%3D&reserved=0>
> Yeşilce Mh. Yunus Emre Cd. Ada İş Mrk. No: 4 Zemin Kat 4. Levent / İstanbul
> 
>  
> 
> 
> 
>  
> <https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.linkedin.com%2Fcompany%2Feuro-message&data=02%7C01%7Cmichael.wise%40microsoft.com%7Cba824f4f24874b17466f08d52170646f%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636451689007378293&sdata=0vEc6997FD1zLeGx%2FlhecJgj10qRsFWBCP2BRTYuwZk%3D&reserved=0>
>  
>  
> <https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.facebook.com%2Feuromessage&data=02%7C01%7Cmichael.wise%40microsoft.com%7Cba824f4f24874b17466f08d52170646f%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636451689007378293&sdata=HsvMmDkwQmj%2BhLWJ4DvOSAADwPm1jGcOs3lUZ4p%2BO58%3D&reserved=0>
>  
>  
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>         
>  
> <https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fblog.euromsg.com%2F&data=02%7C01%7Cmichael.wise%40microsoft.com%7Cba824f4f24874b17466f08d52170646f%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636451689007378293&sdata=zkGT9ve5GVC1tSiIVNtdnHnlfgjvbF8JRz%2BUSIn8%2F9I%3D&reserved=0>
>      
> 
> 
>  
> <https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.relateddigital.com%2F&data=02%7C01%7Cmichael.wise%40microsoft.com%7Cba824f4f24874b17466f08d52170646f%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636451689007378293&sdata=o%2BnZq4ONFkplT3pMdRwYhPoozicnpurxShHT8jbDE7Q%3D&reserved=0>
>  
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>   
>  
> <https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fvisilabs.com%2F%3Futm_source%3Demail-signature%26utm_medium%3Demail&data=02%7C01%7Cmichael.wise%40microsoft.com%7Cba824f4f24874b17466f08d52170646f%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636451689007378293&sdata=lFgxtrEgDZKSzahNV80NDMs5KvpE5XrbZRe6JuxKzeQ%3D&reserved=0>
>  
>  
> <https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.semanticum.com%2F%3Futm_source%3Demail-signature%26utm_medium%3Demail&data=02%7C01%7Cmichael.wise%40microsoft.com%7Cba824f4f24874b17466f08d52170646f%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636451689007378293&sdata=yRAJ03jzpr0AH930eROPQDy9%2FDh5Q0nn9PDGv6Toa%2BM%3D&reserved=0>
>        
>  
> <https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmadebycat.com%2F%3Futm_source%3Demail-signature%26utm_medium%3Demail&data=02%7C01%7Cmichael.wise%40microsoft.com%7Cba824f4f24874b17466f08d52170646f%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636451689007378293&sdata=DU1gXGOp1cbOaNnKLUA9sdi1dwa7sW%2B3UujKSMPj%2BSw%3D&reserved=0>
>     
>       
>       
>  
> <https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.relateddigital.com%2F%3Futm_source%3Demail-signature%26utm_medium%3Demail&data=02%7C01%7Cmichael.wise%40microsoft.com%7Cba824f4f24874b17466f08d52170646f%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636451689007378293&sdata=aFHfxHxITHDwYkENXiLviRlhBUA3GD0XrZ7pBoCsOQM%3D&reserved=0>
>       
>  
> 
> This e-mail message may contain confidential or legally privileged 
> information and is intended only for the use of the intended recipient(s). 
> Any unauthorized disclosure, dissemination, distribution, copying or the 
> taking of any action in reliance on the information herein is prohibited. 
> E-mails are not secure and cannot be guaranteed to be error free as they can 
> be intercepted, amended, or contain viruses. Anyone who communicates with us 
> by e-mail is deemed to have accepted these risks. Related Digital is not 
> responsible for errors or omissions in this message and denies any 
> responsibility for any damage arising from the use of e-mail. Any opinion and 
> other statement contained in this message and any attachment are solely those 
> of the author and do not necessarily represent those of the company.
> 
>  
> 
> 
> 
> 
> -- 
> 
> 
> 
> 
> 
> EMRE ÜST
> 
> Deliverability Specialist
> 
>  
> 
> t.   +902123430739 <tel:(0212)%20343%2007%2039>
> f.   +902123430742 <tel:(0212)%20343%2007%2042>
> 
> email: emre....@euromsg.com <mailto:%23>
> skype: user_name
> web: euromsg.com 
> <https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.euromsg.com%2F%3Futm_source%3Demail-signature%26utm_medium%3Demail&data=02%7C01%7CMichael.Wise%40microsoft.com%7C2f4782c55b2f40a5ef4208d5222d0ad3%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636452499220192627&sdata=hUkYnuVvMooHt9oZtmhz9RogBbNHDz3nWEi99HwvI30%3D&reserved=0>
> Yeşilce Mh. Yunus Emre Cd. Ada İş Mrk. No: 4 Zemin Kat 4. Levent / İstanbul
> 
>  
> 
> 
> 
>  
> <https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.linkedin.com%2Fcompany%2Feuro-message&data=02%7C01%7CMichael.Wise%40microsoft.com%7C2f4782c55b2f40a5ef4208d5222d0ad3%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636452499220192627&sdata=oxXZz6zyu%2FyUIS22CBg4NRk3Kpe1xZEhXCOhiKHUQaM%3D&reserved=0>
>  
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>         
>  
> <https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fblog.euromsg.com%2F&data=02%7C01%7CMichael.Wise%40microsoft.com%7C2f4782c55b2f40a5ef4208d5222d0ad3%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636452499220192627&sdata=mih1VANs6fvO37xnXIgink7vZtAWM8TnZzdEmpbeMuM%3D&reserved=0>
>  
> 
> 
>  
> <https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.relateddigital.com%2F&data=02%7C01%7CMichael.Wise%40microsoft.com%7C2f4782c55b2f40a5ef4208d5222d0ad3%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636452499220192627&sdata=jDKbYgl%2Bbbsf67NBk%2FbxUDyHlJlGSHwD2xvPnXWfI4M%3D&reserved=0>
>  
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>       
>  
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>       
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>       
>  
> 
> This e-mail message may contain confidential or legally privileged 
> information and is intended only for the use of the intended recipient(s). 
> Any unauthorized disclosure, dissemination, distribution, copying or the 
> taking of any action in reliance on the information herein is prohibited. 
> E-mails are not secure and cannot be guaranteed to be error free as they can 
> be intercepted, amended, or contain viruses. Anyone who communicates with us 
> by e-mail is deemed to have accepted these risks. Related Digital is not 
> responsible for errors or omissions in this message and denies any 
> responsibility for any damage arising from the use of e-mail. Any opinion and 
> other statement contained in this message and any attachment are solely those 
> of the author and do not necessarily represent those of the company.
> 
>  
> 
> 
> 
> 
> -- 
> 
>       
> EMRE ÜST
> Deliverability Specialist
>  
> t.   +902123430739 <tel:+90%20212%20343%2007%2039>
> f.   +902123430742 <tel:+90%20212%20343%2007%2042>
> 
> email: emre....@euromsg.com <mailto:%23>
> skype: user_name
> web: euromsg.com 
> <http://www.euromsg.com/?utm_source=email-signature&utm_medium=email>
> Yeşilce Mh. Yunus Emre Cd. Ada İş Mrk. No: 4 Zemin Kat 4. Levent / İstanbul
>  
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