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diff --git a/wiki/mailman.md b/wiki/mailman.md
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@@ -46,3 +46,23 @@ Type "help", "copyright", "credits" or "license" for more information.
>>> email.utils.getaddresses([s])
[('12 45678901234567890123456789012345678901 3456789012345678901234 678901234', 'testing@lists.sigsum.org')]
```
+
+
+2022-08-05 in #mailman@Libera.Chat
+```
+<ln5> hi all, have anyone of you experienced erroneous moderation due to
+ implicit destination when posting with To: "long string with spaces, 76
+ chars will do" <list address>? [09:05]
+<ln5> i tracked it down to mailman/src/mailman/rules/implicit_dest.py and
+ verified that mail.utils.getaddresses() at least doesn't get things
+ wrong, so i guess it might be the msg.get_all(header, []) that's borken
+ [09:07]
+<ln5> now, to debug this what's a decent option? simply editing
+ /usr/lib/python3/dist-packages/mailman/rules/implicit_dest.py (i'm on
+ debian11, with the mailman3 package installed) and adding print()'s? or
+ what do you suggest? [09:10]
+<ln5> to further incite you to care about this, the case is a real one: the
+ dmarc mitigation strategy of rewriting the address part of From: to the
+ list address and composing a fullname part indiciating whoe the sender
+ is can generate a From: header which is then used as To: in a reply
+```