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6 months ago
Nachdem ich mir den Header der Original-Mail nochmal genauer angeschaut habe, könnte auch folgendes von der Spamhaus-Seite zutreffen:
"[...]
b) You found non-delivery reports "bounces" in your mailbox for messages other than your own. This indicates that a third party has sent these emails through your mailbox without your consent.
[...]"
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