We can not send e-mails via DH mail server to our customers who have e-mail servers like msn.com and hotmail.com. It returns error message as below. is DH mail server IP on black list? Any suggestion and solution? Thanks in advance.
email@example.com: host mx3.hotmail.com [18.104.22.168] said: 550 SC-004 (COL0-MC2-F27) Unfortunately, messages from 22.214.171.124 weren’t sent. We recommend that you contact your Internet service provider. The problem is that too many unwanted messages have been sent from the following IP address above. You can also refer your provider to
http://mail.live.com/mail/troubleshooting.aspx#errors. (in reply to MAIL