We have had problems in the past sending e-mails to Microsoft companies (yahoo, outlook, Hotmail etc) from our BO box.
The message we get back in the log is Feb 20 13:54:01 centos7 postfix/smtp[549]: 0D4B13F28A49: to=<xxx...@hotmail.com>, relay=mx2.hotmail.com[65.54.188.126]:25, delay=24, delays=23/0/0.14/0.04, dsn=5.0.0, status=bounced (host mx2.hotmail.com[65.54.188.126] said: 550 SC-001 (BAY004-MC4F21) Unfortunately, messages from 208.67.xxx.xxx 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. (in reply to MAIL FROM command)) For the last few months we have been fortunate to have access to a machine that is allowed to deliver to Microsoft domains. But due to circumstances beyond our control, we are losing access to that machine next week. I have spent a lot of time reading the nonsense document at mail.live.com and am no closer to understanding what we have to do. How is everyone handling getting mail delivered to Microsoft customers?
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