Bei Versand an Outlook-Adressen erhalte ich diese Fehlermeldung:
    Unfortunately, messages from [194.25.134.xx] weren't sent. Please contact
    your Internet service provider since part of their network is on our block
    list (S3140). You can also refer your provider to
    http://mail.live.com/mail/troubleshooting.aspx#errors.
    [DB3EUR04FT048.eop-eur04.prod.protection.outlook.com] (in reply to MAIL