host mx1.optonline.net[188.8.131.52] said: 554
5.0.0 Reverse DNS failed. (in reply to MAIL FROM command)
host mx3.hotmail.com[184.108.40.206] said: 550 SC-001
(COL004-MC2F36) Unfortunately, messages from 220.127.116.11 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)