Hallo,

seit einigen Tagen erhalte ich ca. 500 Spam-mails, die fast alle gleich aussehen:

This is the mail system at host mailout12.t-online.de.

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
<chandamccray5uj@yandex.com>: host mx.yandex.ru[93.158.134.89] said: 550 5.7.1
   Policy rejection on the target address (in reply to RCPT TO command)
Reporting-MTA: dns; mailout12.t-online.de
X-Postfix-Queue-ID: A1DD641F6676
X-Postfix-Sender: rfc822; XXXXXX@t-online.de
Arrival-Date: Thu, 21 Sep 2017 10:23:42 +0200 (CEST)
Final-Recipient: rfc822; chandamccray5uj@yandex.com
Original-Recipient: rfc822;chandamccray5uj@yandex.com
Action: failed
Status: 5.7.1
Remote-MTA: dns; mx.yandex.ru
Diagnostic-Code: smtp; 550 5.7.1 Policy rejection on the target address
Von: XXXXXX@t-online.de

n

Wie gehe ich am besten vor diesen Müll erst gar nicht zu erhalten? Ich arbeite auf Mac mit Programm "mail"

Danke an alle, die mir konstruktive Antworten geben.

LG Robert