Anyone else had a problem sending e-mails to a Hotmail address ? I have tried a few in the past week and get the same error message which points to a problem with Slingshot:The following message to <@hotmail.com> was undeliverable. (I've removed the username)
The reason for the problem:
5.1.0 - Unknown address error 550-"SC-001 (BAY0-MC4-F15) 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. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors."