2017-02-22 Problems with the mailserver. :-( 550 SC-001 (COL004-MC2F9) Unfortunately, messages from 176.28.23.198 weren't sent. Please contact your Internet service provider since part of their network is on our block list. You can also refer your If you need help, write to . 550 SC-001 Mail rejected by Outlook.com for policy reasons. Reasons for rejection may be related to content with spam-like characteristics or IP/domain reputation. If you are not an email/network admin please contact your Email/Internet Service Provider for help. Unfortunately (in this case), I'm my own email service provider myself. ;-) When I checked with [0] my server was on none of the 104 tested blacklists. I later solved it with this ``I'm no spammer'' form. [1] I found it via these websites: [2] [3] [0] https://mxtoolbox.com/SuperTool.aspx [1] https://support.microsoft.com/en- us/getsupport?oaspworkflow=start_1.0.0.0&wfname=capsub&productkey=edfsmsbl3 [2] https://blog.returnpath.com/help-im-blocked-at-outlook/ [3] http://www.hostingfixes.com/email/hotmail-blacklist-removal http://marmaro.de/lue/ markus schnalke