@claudio.faoro reported that we are not able to send e-mails to Hotmail addresses because of some Hotmail blocks.
This is an umbrella task covering everything that can be done from our side to unlock this situation. Assigning this a low priority since we have no fucking clue about how to change the behavior of this service provider.
This is the error code:
Diagnostic-Code: smtp; 550 5.7.1 Unfortunately, messages from [18.104.22.168] 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. [DM3NAM03FT031.eop-NAM03.prod.protection.outlook.com]