Subject: Mail delivery failed: returning message to sender
From: "Mail Delivery System" <[email-masked]>
To: <[email-masked]>
Date: Sat, 30 Mar 2024 10:20:19 +0330

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  [email-masked]
    host smx01.a1.net [80.75.42.227]
    SMTP error from remote mail server after end of data:
    554 5.7.1 Spam message rejected
  [email-masked]
    host mx-ha03.web.de [212.227.15.17]
    SMTP error from remote mail server after RCPT TO:<[email-masked]>:
    550 Requested action not taken: mailbox unavailable