Re: [mailop] [EXTERNAL] outlook.com 421 try again later S77719

[Michael Wise via mailop]

I have no idea, and try not to make public facing statements, sorry.

Aloha,
Michael.
—
“Your Spam Specimen Has Been Processed,”

From: mailop  on behalf of Johann Klasek via mailop 

Sent: Wednesday, October 11, 2023 11:50:16 AM
To: Michael Wise via mailop 
Subject: Re: [mailop] [EXTERNAL] outlook.com 421 try again later S77719

Hi Michael!

On Wed, Oct 11, 2023 at 06:07:13PM +, Michael Wise via mailop wrote:
>
> That's volume throttling, not IP blocking.
> Did you recently bring a new block online, or ... someone sending out an 
> abnormally large volume of mail?
> If it's going out thru shared IPs, that could also be part of the problem, 
> but this is just speculation.

What about

Deferred:  451 4.7.500 Server busy. Please try again later from [x.x.x.x].  
(S77719) [VI1EUR05FT)

This suddently occured from 11 or 12 o'clock (+0200) until around 19
o'clock (+0200). The backlogs in our queues are now gone.

On our site we could rule out any increase in traffice or "new" ip
addresses.

A lot of our customer blamed us for not delivering e-mail
properly and they are surly eager to know what happend to the "hosting
provider" of their communication partners.

Is there any (more less official) statement regarding this? Maybe you
have an explanation for us ...

Thanks a lot in advance.

Johann

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Re: [mailop] [EXTERNAL] outlook.com 421 try again later S77719

[Johann Klasek via mailop]

Hi Michael!

On Wed, Oct 11, 2023 at 06:07:13PM +, Michael Wise via mailop wrote:
> 
> That's volume throttling, not IP blocking.
> Did you recently bring a new block online, or ... someone sending out an 
> abnormally large volume of mail?
> If it's going out thru shared IPs, that could also be part of the problem, 
> but this is just speculation.

What about 

Deferred:  451 4.7.500 Server busy. Please try again later from [x.x.x.x].  
(S77719) [VI1EUR05FT)

This suddently occured from 11 or 12 o'clock (+0200) until around 19
o'clock (+0200). The backlogs in our queues are now gone.

On our site we could rule out any increase in traffice or "new" ip
addresses.

A lot of our customer blamed us for not delivering e-mail
properly and they are surly eager to know what happend to the "hosting
provider" of their communication partners.

Is there any (more less official) statement regarding this? Maybe you
have an explanation for us ...

Thanks a lot in advance.

Johann

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Re: [mailop] [EXTERNAL] outlook.com 421 try again later S77719

[Giovanni Bechis via mailop]

Michael,
this seems related to a Microsoft known issue:
https://learn.microsoft.com/en-us/answers/questions/1388775/outlook-com-servers-tells-server-busy-please-try-a
 Regards
Giovanni

Il 11 ottobre 2023 20:07:13 CEST, Michael Wise via mailop  
ha scritto:
>
>That's volume throttling, not IP blocking.
>Did you recently bring a new block online, or ... someone sending out an 
>abnormally large volume of mail?
>If it's going out thru shared IPs, that could also be part of the problem, but 
>this is just speculation.
>
>Aloha,
>Michael.
>--
>Michael J Wise
>Microsoft Corporation| Spam Analysis
>"Your Spam Specimen Has Been Processed."
>Open a ticket for Hotmail ?
>
>From: mailop  On Behalf Of Andreas via mailop
>Sent: Wednesday, October 11, 2023 2:13 AM
>To: mailop@mailop.org
>Subject: [EXTERNAL] [mailop] outlook.com 421 try again later S77719
>
>
>Hello all,
>
>since a few hours we have problems with sending to Microsoft. We get hundreds 
>of messages like in the subject with the reference to S77719. Also colleagues 
>from other companies in germany are seeing the same in their logs. All mails 
>that are blocked here are from Microsoft customers, but they are redirected 
>through our servers.
>
>Trying to unblock the IP e.g. via https://sender.office.com/ shows that the 
>IPs are not blocked.
>
>Anybody have any idea?
>
>Thanks a lot
>Andreas
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Re: [mailop] [EXTERNAL] outlook.com 421 try again later S77719

[Michael Wise via mailop]

That's volume throttling, not IP blocking.
Did you recently bring a new block online, or ... someone sending out an 
abnormally large volume of mail?
If it's going out thru shared IPs, that could also be part of the problem, but 
this is just speculation.

Aloha,
Michael.
--
Michael J Wise
Microsoft Corporation| Spam Analysis
"Your Spam Specimen Has Been Processed."
Open a ticket for Hotmail ?

From: mailop  On Behalf Of Andreas via mailop
Sent: Wednesday, October 11, 2023 2:13 AM
To: mailop@mailop.org
Subject: [EXTERNAL] [mailop] outlook.com 421 try again later S77719


Hello all,

since a few hours we have problems with sending to Microsoft. We get hundreds 
of messages like in the subject with the reference to S77719. Also colleagues 
from other companies in germany are seeing the same in their logs. All mails 
that are blocked here are from Microsoft customers, but they are redirected 
through our servers.

Trying to unblock the IP e.g. via https://sender.office.com/ shows that the IPs 
are not blocked.

Anybody have any idea?

Thanks a lot
Andreas
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