Hello,
It's odd anyone is blocking messages. apache.org does not have a DMARC
record, and so anything your email service is blocking is non-standard.
apache.org appears to have 2 SPF records (both v1 and v2). Are you able
to get anything from one of these blocked messages (e.g. by special
request to your email provider)? I'd be interested to see the path those
messages take to get to you and if SPF alone can be blamed somehow.
-chris
On 4/17/26 8:08 AM, 2380189206 wrote:
Yes, they are all working well.
On 2026/04/17 11:15:11 Gary Gregory wrote:
Do you subscribe to non-Apache mailing lists and do these come through OK?
Gary
On Fri, Apr 17, 2026 at 5:34 AM 2380189206 <[email protected]> wrote:
I am writing to report an ongoing email deliver-ability issue that has been
preventing users from receiving emails from apache.org since at least May 2025.
Emails sent from Apache mailing lists (e.g., @ozone.apache.org,
@hadoop.apache.org, and other Apache project subdomains) are being blocked by
Outlook. The root cause appears to be that these emails are not carrying DKIM
signatures, which seems to have triggered Microsoft's security policies
implemented around April 2025 (
https://techcommunity.microsoft.com/blog/microsoftdefenderforoffice365blog/strengthening-email-ecosystem-outlook%E2%80%99s-new-requirements-for-high%E2%80%90volume-senders/4399730
).
This issue was first reported by users on Microsoft's community forum (
https://learn.microsoft.com/en-us/answers/questions/4722114/unable-to-receive-emails-from-******@ozone-apache
) as early as June 2025. In this post, the user confirmed that he stopped
receiving messages suddenly in June 2025, and standard troubleshooting (safe
sender lists, checking junk folders) did not resolve the issue, indicating it
is not an isolated incident but a systemic infrastructure conflict between
Apache's email setup and Outlook's filtering rules.
As of today (April 2026), this problem persists (
https://www.reddit.com/r/Outlook/comments/1smr1x7/anyone_else_having_issues_subscribing_to_apache/
). This blockage is severely disrupting communication for developers and users
who rely on these mailing lists for critical project updates and support.
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