Wie kann es sein, dass ich Infos vom Mail-Delivery-System bekomme, dass Mails (angeblich) von mir nicht angekommen seien obwohl ich diese Mail NIEMALS gesendet habe? Kann mir jemand helfen?
Vielen Dank!

So zum Beispiel :

This is the mail system at host mx.pec.aruba.it. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to postmaster. If you do so, please include this problem report. You can delete your own text from the attached returned message. The mail system <vicenza@cng.it>: host mailfree.cng.it[62.149.157.151] said: 552 5.2.0 PPEN2400726fsmP01PENy8 spam detected (in reply to end of DATA command)