El 20/5/19 13:12, "Mail Delivery System" <mailer-daemon@kundenserver.de> escribió:

    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:

    annazammitt@hotmail.com:
    SMTP error from remote server for MAIL FROM command, host: hotmail-com.olc.protection.outlook.com (104.47.5.33) reason: 550 5.7.1 Unfortunately, messages from [212.227.126.131] weren't sent. Ple
    ase contact your Internet service provider since part of their network
     is on our block list (S3140). You can also refer your provider to htt
    p://mail.live.com/mail/troubleshooting.aspx#errors. [HE1EUR02FT050.eop
    -EUR02.prod.protection.outlook.com]