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<p dir="auto">Benny,</p>
<p dir="auto">Many thanks for the reaction & input.</p>
<p dir="auto">I can perfectly live in this “via-world”, even better since I now understand the “root-cause”( anyhow prefer this to the meta one ;-) ).</p>
<p dir="auto">Our very best wishes, that 2024 might bring you health, happiness and more then you wish for.</p>
<p dir="auto">Kindest regards,</p>
<p dir="auto">Marc</p>
<p dir="auto">On 21 Dec 2023, at 19:38, Benny Kjær Nielsen wrote:</p>
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<p dir="auto">On 20 Dec 2023, at 4:55, Quinn Comendant via mailmate wrote:</p>
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<p dir="auto">On 19 Dec 2023, at 16:06, Bill Cole wrote:</p>
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<p dir="auto">Mailman modifies the "From" header of messages sent from domains which would otherwise be widely rejected […]<br>
I won't try to pick apart the precise details for this list. Perhaps Benny can explain the specific rules.</p>
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<p dir="auto">Mailman checks the DMARC policy published to the DNS TXT records of the domain in the "From" header of the original message. If the policy is 'p=reject' or 'p=quarantine', Mailman may modify the "From" header to use the list's email address or the server's hostname to prevent rejection due to DMARC, SPF, or DKIM checks.</p>
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<p dir="auto">Bill and Quinn are correct. The “via” is a workaround for DMARC-issues with the mailing list. This is one of those subjects where I feel like I have to start over every time I want to understand the details of what's going on ;-)</p>
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<p dir="auto">It doesn't treat all senders the same because some people self-host their email domain and don't use DKIM or SPF.</p>
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<p dir="auto">Ironically, the mailing list server for MailMate is self-hosted (by me) and it has only been using SPF. This seems to have been a serious problem with Gmail addresses (I think many/most of them have been thrown off the list by MailMan by now).</p>
<p dir="auto">Hopefully, the changes I've made today (on the server) means that DKIM will work going forward. That should make Google happy: <a href="https://blog.google/products/gmail/gmail-security-authentication-spam-protection/" style="color: #777777;">https://blog.google/products/gmail/gmail-security-authentication-spam-protection/</a></p>
<p dir="auto">This will NOT solve the problem which makes the use of “via” necessary for some correspondents. If I understand it correctly then a standard solution does exist now, but it's not a high priority for me to make that work: <a href="https://en.wikipedia.org/wiki/Authenticated_Received_Chain" style="color: #777777;">https://en.wikipedia.org/wiki/Authenticated_Received_Chain</a></p>
<p dir="auto">--<br>
Benny</p>
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<p dir="auto">mailmate mailing list<br>
<a href="mailto:mailmate@lists.freron.com" style="color: #777777;">mailmate@lists.freron.com</a><br>
<a href="https://lists.freron.com/listinfo/mailmate" style="color: #777777;">https://lists.freron.com/listinfo/mailmate</a></p>
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