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

[Jaroslaw Rafa via mailop]

Dnia 12.10.2023 o godz. 11:05:04 Otto J. Makela via mailop pisze:
> Microsoft had an about 16 hour period of time where their servers
> only gave a "451 4.7.500 Server busy" for their hosted domains. We saw
> these in the time range 2023-10-11T04:45/20:17+03:00, and in that time
> we had mails queued for about 300 different domains hosted with them.

That's the downside of giving someone's email into hands of a big company
instead of self-hosting or hosting at a small ISP.

If these 300 domains would use 200 different hosters instead of just one,
and one of these 200 hosters would mess things up, the impact on email
ecosystem as a whole would be much less.

The Internet was meant to be distributed, not centralized!
-- 
Regards,
   Jaroslaw Rafa
   r...@rafa.eu.org
--
"In a million years, when kids go to school, they're gonna know: once there
was a Hushpuppy, and she lived with her daddy in the Bathtub."
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Re: [mailop] outlook.com 421 try again later S77719

[MK via mailop]

>> I have not seen the error message anywhere anymore since yesterday 17:20 
>> UTC. Are you still using the new outgoing IP addresses? Maybe they have no 
>> >>history/reputation and are therefor limited by Microsoft.

That was exact the problem. After changing ip addresses back again it now works.

Regards,
Oliver
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Re: [mailop] outlook.com 421 try again later S77719

[Otto J. Makela via mailop]

On 10/11/23 12:12, Andreas via mailop wrote:


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.


Microsoft had an about 16 hour period of time where their servers
only gave a "451 4.7.500 Server busy" for their hosted domains. We saw
these in the time range 2023-10-11T04:45/20:17+03:00, and in that time
we had mails queued for about 300 different domains hosted with them.

--
   /* * * Otto J. Makela  * * * * * * * * * */
  /* Phone: +358 40 765 5772, ICBM: N 60 10' E 24 55' */
 /* Mail: Mechelininkatu 26 B 27,  FI-00100 Helsinki */
/* * * Computers Rule 0100 01001011 * * * * * * */

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

[Gellner, Oliver via mailop]

On 12.10.2023 at 09:00 MK via mailop wrote:

> next day, same problem.
> I also read the statement from Microsoft that the problem should be fixed but 
> I can not confirm this.
> https://learn.microsoft.com/en-us/answers/questions/1388775/outlook-com-servers-tells-server-busy-please-try-a
> Here the Post from the Link above:
> #
> https://learn.microsoft.com/en-us/users/na/?userid=8c91b715-58bf-46e9-95de-052268af99f3
>  35,576 Reputation points
> Oct 12, 2023, 4:54 AM
> Hi all,
> As I posted in the reply below, this Exchange service incident has been fixed 
> by now. You can check it from your side and see if everything is normal now.
> By the way, considering that it's a public community, it's recommended to 
> removing all sensitive data like IP addresses in your posts for privacy 
> concern. Thanks for your understanding.
> #
> I have just checked 2 of our servers and flushed the queue to check if the 
> problems are solved. We also get the same error messages as yesterday.
> 451 4.7.500 Server busy. Please try again later from [x.x.x.x]. (S77719) 
> [FR2DEU01FT006.eop-deu01.prod.protection.outlook.com 2023-10-12T06:46:15.335Z 
> 08DBCAAE0FF42AE9] (in reply to end of DATA command))
> I have changed the outgoing ip addresses of some of the servers yesterday and 
> for an half day this works for us. Since tommorow moring 03:21 UTC we have 
> the same problems again. So ip address change did not solve it.
> Anyone also problems today?

I have not seen the error message anywhere anymore since yesterday 17:20 UTC. 
Are you still using the new outgoing IP addresses? Maybe they have no 
history/reputation and are therefor limited by Microsoft.

--
BR Oliver


dmTECH GmbH
Am dm-Platz 1, 76227 Karlsruhe * Postfach 10 02 34, 76232 Karlsruhe
Telefon 0721 5592-2500 Telefax 0721 5592-2777
dmt...@dm.de * www.dmTECH.de
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Geschäftsführer: Christoph Werner, Martin Dallmeier, Roman Melcher

Datenschutzrechtliche Informationen
Wenn Sie mit uns in Kontakt treten, beispielsweise wenn Sie an unser 
ServiceCenter Fragen haben, bei uns einkaufen oder unser dialogicum in 
Karlsruhe besuchen, mit uns in einer geschäftlichen Verbindung stehen oder sich 
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Re: [mailop] outlook.com 421 try again later S77719

[MK via mailop]

Good Morning Everyone,

next day, same problem.
I also read the statement from Microsoft that the problem should be fixed but I 
can not confirm this.

https://learn.microsoft.com/en-us/answers/questions/1388775/outlook-com-servers-tells-server-busy-please-try-a

Here the Post from the Link above:

#
Yuki 
Sun-MSFT<https://learn.microsoft.com/en-us/users/na/?userid=8c91b715-58bf-46e9-95de-052268af99f3>
 35,576 Reputation points
Oct 12, 2023, 4:54 AM
Hi all,
As I posted in the reply below, this Exchange service incident has been fixed 
by now. You can check it from your side and see if everything is normal now.
By the way, considering that it's a public community, it's recommended to 
removing all sensitive data like IP addresses in your posts for privacy 
concern. Thanks for your understanding.
#

I have just checked 2 of our servers and flushed the queue to check if the 
problems are solved. We also get the same error messages as yesterday.

451 4.7.500 Server busy. Please try again later from [x.x.x.x]. (S77719) 
[FR2DEU01FT006.eop-deu01.prod.protection.outlook.com 2023-10-12T06:46:15.335Z 
08DBCAAE0FF42AE9] (in reply to end of DATA command))

I have changed the outgoing ip addresses of some of the servers yesterday and 
for an half day this works for us. Since tommorow moring 03:21 UTC we have the 
same problems again. So ip address change did not solve it.

Anyone also problems today?

Regards,
Oliver


Von: mailop  Im Auftrag von Gellner, Oliver via 
mailop
Gesendet: Mittwoch, 11. Oktober 2023 22:35
An: mailop@mailop.org
Betreff: Re: [mailop] outlook.com 421 try again later S77719


On 11.10.2023 at 11:24 Andreas via mailop wrote:

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.

After 16 hours the problem was fixed by Microsoft. Emails should get accepted 
again as they have been before the outage.

Unfortunately Microsoft only provides updates and details about this issue on 
their admin center website, which is only accessible by administrators of O365 
accounts.

—
BR Oliver

dmTECH GmbH
Am dm-Platz 1, 76227 Karlsruhe * Postfach 10 02 34, 76232 Karlsruhe
Telefon 0721 5592-2500 Telefax 0721 5592-2777
dmt...@dm.de<mailto:dmt...@dm.de> * www.dmTECH.de<http://www.dmtech.de>
GmbH: Sitz Karlsruhe, Registergericht Mannheim, HRB 104927
Geschäftsführer: Christoph Werner, Martin Dallmeier, Roman Melcher

Datenschutzrechtliche Informationen
Wenn Sie mit uns in Kontakt treten, beispielsweise wenn Sie an unser 
ServiceCenter Fragen haben, bei uns einkaufen oder unser dialogicum in 
Karlsruhe besuchen, mit uns in einer geschäftlichen Verbindung stehen oder sich 
bei uns bewerben, verarbeiten wir personenbezogene Daten. Informationen unter 
anderem zu den konkreten Datenverarbeitungen, Löschfristen, Ihren Rechten sowie 
die Kontaktdaten unserer Datenschutzbeauftragten finden Sie 
hier<https://www.dm.de/datenschutzerklaerung-kommunikation-mit-externen-493832>.
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Re: [mailop] outlook.com 421 try again later S77719

[Gellner, Oliver via mailop]

On 11.10.2023 at 11:24 Andreas via mailop wrote:

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.

After 16 hours the problem was fixed by Microsoft. Emails should get accepted 
again as they have been before the outage.

Unfortunately Microsoft only provides updates and details about this issue on 
their admin center website, which is only accessible by administrators of O365 
accounts.

—
BR Oliver

dmTECH GmbH
Am dm-Platz 1, 76227 Karlsruhe * Postfach 10 02 34, 76232 Karlsruhe
Telefon 0721 5592-2500 Telefax 0721 5592-2777
dmt...@dm.de * www.dmTECH.de
GmbH: Sitz Karlsruhe, Registergericht Mannheim, HRB 104927
Geschäftsführer: Christoph Werner, Martin Dallmeier, Roman Melcher

Datenschutzrechtliche Informationen
Wenn Sie mit uns in Kontakt treten, beispielsweise wenn Sie an unser 
ServiceCenter Fragen haben, bei uns einkaufen oder unser dialogicum in 
Karlsruhe besuchen, mit uns in einer geschäftlichen Verbindung stehen oder sich 
bei uns bewerben, verarbeiten wir personenbezogene Daten. Informationen unter 
anderem zu den konkreten Datenverarbeitungen, Löschfristen, Ihren Rechten sowie 
die Kontaktdaten unserer Datenschutzbeauftragten finden Sie 
hier.
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Re: [mailop] outlook.com 421 try again later S77719

[Cedric Knight via mailop]

Date: Wed, 11 Oct 2023 16:27:13 +0200
From: Alessio Cecchi 
> I confirm that, emails in the queue are only to
> "eur0x.prod.outlook.com" MX.

Not for us in UK.  Of MXs that give
  451 4.7.500 Server busy. Please try again later from ... (S77719)

about 50% self-identify as EU, but also many from
eop-AUS01.prod.protection.outlook.com
namprd02.prod.outlook.com
eop-gbr01.prod.protection.outlook.com etc.  So no correlation for us.
It's throttling that causes delivery delays of over 10 hours in some cases.

Problem began around 0100 UTC.  MS has little public apart from
https://learn.microsoft.com/en-us/answers/questions/1388775/outlook-com-servers-tells-server-busy-please-try-a

"Some users may encounter delays receiving external email messages in
Exchange"
"We’ve identified that a recent service update, applied to a section of
infrastructure responsible for enforcing IP address anti-spam rules,
contains a change which is inadvertently causing impact. We’re
developing and validating a fix to revert to the most recent stable
service version to remediate impact. In parallel, we’re continuing to
manually add reported affected IP addresses to an allowed list to
alleviate impact in the short term."

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

[Giovanni Bechis via mailop]

I have issues at least with "namprd04.prod.outlook" and 
"nam12.prod.protection.outlook" as well.
 Regards
   Giovanni

On 10/11/23 16:06, Lilium via mailop wrote:


It appears to us that the delay only affects EU SMTP servers.
US SMTP servers delivery is fine.

Regards
Andrea


On 11/10/2023 11:12, Andreas via mailop wrote:

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] outlook.com 421 try again later S77719

[Alessio Cecchi via mailop]

I confirm that, emails in the queue are only to "eur0x.prod.outlook.com" MX.

Il 11/10/23 16:06, Lilium via mailop ha scritto:


It appears to us that the delay only affects EU SMTP servers.
US SMTP servers delivery is fine.

Regards
Andrea


On 11/10/2023 11:12, Andreas via mailop wrote:

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] outlook.com 421 try again later S77719

[Lilium via mailop]

It appears to us that the delay only affects EU SMTP servers.
US SMTP servers delivery is fine.

Regards
Andrea


On 11/10/2023 11:12, Andreas via mailop wrote:

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] outlook.com 421 try again later S77719

[Paul Smith* via mailop]

On 11/10/2023 10:12, Andreas via mailop wrote:



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.


Yes, exactly the same thing here. I was worried it was something we'd 
done, but it appears to be a bit more widespread


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

[Paul Smith* via mailop]

On 11/10/2023 10:48, Urban Loesch via mailop wrote:

Hi,

same here in north Italy.
Also users on Reddit encounter the same: 
https://www.reddit.com/r/sysadmin/comments/1755npg/anyone_else_seeing_outlook_mail_delivery_problems/



That points to an issue in the M365 admin -> Healt -> service status 
section where this is mentioned


"

EX680695, Last updated: 11 October 2023 at 11:51 BST
Estimated start time: 11 October 2023 at 01:00 BST

More info: Affected users may see a "451 4.7.500 Server busy" error 
message. Current status: We’ve identified that specific IP addresses are 
being unexpectedly limited by our anti-spam procedures, causing inbound 
external email delivery to become throttled and delayed. We're reviewing 
if there have been any recent changes to our anti-spam rules to 
understand why the IP addresses are being limited. In the meantime, 
we're manually adding reported affected IP addresses to an allowed list 
to provide immediate relief."


They're manually adding IP addresses... Sounds a fun job. Just got to 
work out how to report them now



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

[Andreas via mailop]

We did that too, but after about 200 mails the IP was burned too

Am 11.10.2023 um 11:59 schrieb Alessio Cecchi via mailop:


Hello,

We have also detected this anomaly on some of our IPs. At the moment 
we have solved it by relaing the queued messages from our other IPs 
and they have been accepted regularly. This is why I thought the 
problem was only ours.


Ciao

Il 11/10/23 11:12, Andreas via mailop ha scritto:


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] outlook.com 421 try again later S77719

[Yvan Watchman | Soverin via mailop]

Hello,

We have detected the same issues on our side, by rerouting the mail 
traffic to a lower volume server group it got temporarily solved for us.


Alessio Cecchi via mailop schreef op 2023-10-11 11:59:


Hello,

We have also detected this anomaly on some of our IPs. At the moment we 
have solved it by relaing the queued messages from our other IPs and 
they have been accepted regularly. This is why I thought the problem 
was only ours.


Ciao

Il 11/10/23 11:12, Andreas via mailop ha scritto:


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] outlook.com 421 try again later S77719

[Alessio Cecchi via mailop]

Hello,

We have also detected this anomaly on some of our IPs. At the moment we 
have solved it by relaing the queued messages from our other IPs and 
they have been accepted regularly. This is why I thought the problem was 
only ours.


Ciao

Il 11/10/23 11:12, Andreas via mailop ha scritto:


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] outlook.com 421 try again later S77719

[Eduardo Silvestre via mailop]

+1

On Wed, 11 Oct 2023 at 10:53, Kevin Kelker via mailop 
wrote:

> Hi List,
>
> was about to write the same just when Andreas' mail popped up.
> Also noticing an increasing amount of mails towards Microsoft getting
> deferred with
>  451 4.7.500 Server busy. Please try again later from [x.x.x.x]. (S77719)
>
>
> We see this happening for different from-domains as well for different
> sender-IPs since about 0300 UTC and have also reports
> of other ISP having the same issue. We are using their SNDS and none of
> the sender-IPs are flagged on their side.
>
> Maybe someone from MS could take a look into this as our queues are piling
> up.
>
> Best
> Kevin
>
> --
> *Von:* mailop  im Auftrag von Andreas via
> mailop 
> *Gesendet:* Mittwoch, 11. Oktober 2023 11:12:39
> *An:* mailop@mailop.org
> *Betreff:* [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] outlook.com 421 try again later S77719

[Urban Loesch via mailop]

Hi,

same here in north Italy.
Also users on Reddit encounter the same: 
https://www.reddit.com/r/sysadmin/comments/1755npg/anyone_else_seeing_outlook_mail_delivery_problems/

Best regards
Urban


Am 11.10.23 um 11:34 schrieb lukn via mailop:

Hi Andreas

We encounter the same thing. My guess is that issue is caused somewhere in Redmond. Hence I doubt there is anything we can do (except recommend using 
proper mail hosting operators...)


Best regards

On 11.10.23 11:12, Andreas via mailop wrote:

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] outlook.com 421 try again later S77719

[Kevin Kelker via mailop]

Hi List,

was about to write the same just when Andreas' mail popped up.
Also noticing an increasing amount of mails towards Microsoft getting deferred 
with
 451 4.7.500 Server busy. Please try again later from [x.x.x.x]. (S77719)


We see this happening for different from-domains as well for different 
sender-IPs since about 0300 UTC and have also reports
of other ISP having the same issue. We are using their SNDS and none of the 
sender-IPs are flagged on their side.

Maybe someone from MS could take a look into this as our queues are piling up.

Best
Kevin



Von: mailop  im Auftrag von Andreas via mailop 

Gesendet: Mittwoch, 11. Oktober 2023 11:12:39
An: mailop@mailop.org
Betreff: [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] outlook.com 421 try again later S77719

[Andreas S. Kerber via mailop]

Am Wed, Oct 11, 2023 at 11:12:39AM +0200 schrieb Andreas via mailop:
> 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

I'm glad you're bringing this up. We're seeing this here as well.
Microsoft status pages seem unaware of this issue (at least as of yet).
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Re: [mailop] outlook.com 421 try again later S77719

[lukn via mailop]

Hi Andreas

We encounter the same thing. My guess is that issue is caused somewhere 
in Redmond. Hence I doubt there is anything we can do (except recommend 
using proper mail hosting operators...)


Best regards

On 11.10.23 11:12, Andreas via mailop wrote:

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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