[AusNOG] Outlook 365 Email Issues

[Shane Chrisp]

Just for those who may be wondering what the issue is. This is from 
Microsoft.


11 October 2023 at 12:22 pm AWST

Title: Users are unable to receive external email messages within 
Exchange Online User impact: Users are unable to receive external email 
messages within Exchange Online. Current status: We're investigating a 
potential issue and checking for impact to your organization. We'll 
provide an update within 30 minutes.

11 October 2023 at 12:52 pm AWST

Title: Users are unable to receive external email messages within 
Exchange Online User impact: Users are unable to receive external email 
messages within Exchange Online. Current status: We're currently 
reviewing simple messages to refine our understanding of this specific 
impact scenario and establish our troubleshooting steps. Scope of 
impact: Your organization is impacted by this event, as well as users 
who are attempting to receive external email messages within Exchange 
Online. Next update by: Wednesday, October 11, 2023 at 2:30 PM GMT+8

11 October 2023 at 2:33 pm AWST

Title: Users are unable to receive external email messages within 
Exchange Online User impact: Users are unable to receive external email 
messages within Exchange Online. More info: Some users email messages 
may send; however, users may experience delays up to one hour. Current 
status: Our review of simple messages has lead us to a potential root 
cause where a portion of SQL infrastructure may be receiving an 
unusually large number of requests that may be hindering Exchange 
Online's performance. We're working to confirm our findings to cultivate 
further troubleshooting steps. Scope of impact: Your organization is 
impacted by this event, as well as users who are attempting to receive 
external email messages within Exchange Online. Next update by: 
Wednesday, October 11, 2023 at 4:30 PM GMT+8

11 October 2023 at 4:59 pm AWST

Title: Some users may encounter delays receiving external email messages 
in Exchange Online User impact: Users may encounter delays receiving 
external email messages in Exchange Online. More info: Affected users 
may see a "451 4.7.500 Server busy" error message. Current status: We’re 
analyzing sample throttling IPs from simple messages to confirm whether 
the issue with the portion of SQL infrastructure is causing impact, 
before we begin formulating a remediation plan. Scope of impact: Impact 
is specific to some users who are served through the affected 
infrastructure. Next update by: Wednesday, October 11, 2023 at 7:00 PM GMT+8

11 October 2023 at 6:26 pm AWST

Title: Some users may encounter delays receiving external email messages 
in Exchange Online User impact: Users may encounter delays receiving 
external email messages in Exchange Online. 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. 
Scope of impact: Impact is specific to some users who are served through 
the affected infrastructure. Next update by: Wednesday, October 11, 2023 
at 8:30 PM GMT+8

Regards

Shane


> On 11/10/23 12:28, Max Parsons wrote:
>
> Thanks for the reply Max. Its always good to know that its not just 
> you. Hopefully they get it resolved soon.
> -- 
> Regards
>
> Shane Chrisp
> 2000 Computers & Networks Pty Ltd
> U8, 19 Outram St, West Perth, WA 6005
> Ph 08 6298 7391 Fx 08 6298 7393
> Mb 0412 409 856
> Emailshane at 2000cn.com.au
> Webhttp://www.2000cn.com.au
>
>
>> We are also seeing this. Support let us know there were some issues 
>> with emails from the Barracuda cloud, but we are on-prem.
>>
>> 451 4.7.500 Server busy. Please try again later from [103.21.17.178]. 
>> (S77714) [ME3AUS01FT022.eop-AUS01.prod.protection.outlook.com 
>> <http://ME3AUS01FT022.eop-AUS01.prod.protection.outlook.com> 
>> 2023-10-11T04:06:47.950Z
>>
>> The queue is over 4000 emails at the moment.
>>
>> - Max
>>
>> On Wed, 11 Oct 2023 at 15:24, Shane Chrisp <shane at 2000cn.com.au> wrote:
>>
>>     Hi All,
>>
>>     Just wondering if others are seeing issues with email for
>>     delivery to Outlook 365 queuing up with "4.7.500 Server busy.
>>     Please try again later" messages?
>>
>>     Our mail queue has been getting progressively larger since about
>>     10am WAST today and of course the MS outage site shows no issues,
>>     though some of the down detector sites how others seem to be
>>     having issues.
>>
>>     -- 
>>     Regards
>>
>>     Shane Chrisp
>>     2000 Computers & Networks Pty Ltd
>>     U8, 19 Outram St, West Perth, WA 6005
>>     Ph 08 6298 7391 Fx 08 6298 7393
>>     Mb 0412 409 856
>>     Emailshane at 2000cn.com.au
>>     Webhttp://www.2000cn.com.au
>>
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>
>
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-- 
Regards

Shane Chrisp
2000 Computers & Networks Pty Ltd
U8, 19 Outram St, West Perth, WA 6005
Ph 08 6298 7391 Fx 08 6298 7393
Mb 0412 409 856
Emailshane at 2000cn.com.au
Webhttp://www.2000cn.com.au
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