On 2024-08-22 at 16:12:26 UTC-0400 (Fri, 23 Aug 2024 04:12:26 +0800)
horizon--- via mailop
is rumored to have said:
As a postmaster, I often receive assistance investigation emails from
official organizations in certain countries (which I have not
confirmed) such as intelligence agencies and c
Are you sending to M365/Exchange Online tenants, or Hotmail/Outlook.com
accounts? if it's consumer facing use https://olcsupport.office.com/ to put in
a ticket.
If it's EXO tenants, you may need the assistance of one or your partners who
host their mail there to put in an internal ticket withi
On 2024-08-22 at 17:53:07 UTC-0400 (Fri, 23 Aug 2024 05:53:07 +0800)
horizon--- via mailop
is rumored to have said:
If the other party provides evidence, such as our users suspected of
participating in terrorist attacks, is it necessary to directly
provide relevant information out of humanitar
Tobias Grychtol-Matthaeus via mailop kirjoitti 22.8.2024 22:46:
The Microsoft demicery team wrote me round about 36 hours before
now, that they mitigated the IP address and that it should work now.
It still does not work. I send all bounce emails to
del...@microsoft.com like it was written in t
Hello,
> Same situation here, Microsoft suddenly blocking our main server for all
> M365 domains with the same 5.7.511 error code. No indications on what
> could have possibly triggered the issue. All DMARC reports are clean, no
> marketing emails, no known hacked accounts, no clear suspects. The
Hello - We are currently managing several domains that are experiencing
spoofing attacks, which led us to implement a p=reject policy. We monitor
these domains through Uriports, and while all DKIM/SPF validations pass,
exceptions arise with emails routed through security providers such as
Cloudflar
Yes, you can disregard those. Most customers of security gateways exempt
the gateway IPs from further checking on the final mailbox.
I don't think any of those gateways use ARC yet, but if they did, that
would also help (in case they didn't whitelist their gateway IPs).
Here's a good explaine
It appears that Alex Shakhov via mailop said:
>-=-=-=-=-=-
>-=-=-=-=-=-
>
>Hello - We are currently managing several domains that are experiencing
>spoofing attacks, which led us to implement a p=reject policy. We monitor
>these domains through Uriports, and while all DKIM/SPF validations pass,
>e
If the traffic passes thru a filtering gateway in front of the recipient
server, SPF will fail.
Also, if that gateway modified the Subject, From, or prepends a message about
it being, “External” in the body of the message, then DKIM will fail.
And in either of the above, DMARC will almost certai
On 8/23/2024 1:34 PM, Alex Shakhov via mailop wrote:
We are currently managing several domains that are experiencing
spoofing attacks, which led us to implement a p=reject policy.
In terms of the mechanical details, what exactly is the attack and how
is it affecting your email service?
We
Michael - Thank you for sharing this! Inky, for example, includes an
external notification in the email body. However, we have never received a
rejection notification for emails that failed DMARC. We suspect that some
emails sent to M365 users registered through GoDaddy with Proofpoint add-on
are s
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