On 02/09/2018 04:11 AM, Udhay Shankar N wrote:
On Fri, Feb 9, 2018 at 7:22 AM, Tomasz Rola <rto...@ceti.pl> wrote:

Lo and behold, my connection has been cut off for few hours...
​It looks like your ISP is on Microsoft's blocklist. You should check with
them. See below, ​your message is bouncing to all silklist addresses within
the Microsoft universe:

     550 5.7.1 Unfortunately, messages from [50.23.85.242] weren't sent.
Please contact your Internet service provider since part of their network
is on our block list (AS3140). You can also refer your provider to
http://mail.live.com/mail/troubleshooting.aspx#errors. [
DM3NAM03FT057.eop-NAM03.prod.protection.outlook.com]


Looks like the IP block of lists.hserus.net is on Microsoft's blocklist. Not Tomasz's.



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