Hi All,
Need your expertise.
We set up a new exchange server 2013 on Windows 2012. We are having issues sending mails to hotmail and some other external domains.
-users can send and receive mails from internal clients
-users can receive mails from external clients but cannot send
-rDNS checked and DNS settings done
-users can now send to some of external clients but not all
-can send to yahoo, gmail but not hotmail and also other external clients
Error message from Hotmail:
COL0-MC3-F51.Col0.hotmail.com rejected your message to the following email addresses:
user (user@hotmail.com)
COL0-MC3-F51.Col0.hotmail.com gave this error:
OU-002 (COL0-MC3-F51) Unfortunately, messages from 220.255.57.2 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.
A problem occurred while delivering this message to this email address. Try sending this message again. If the problem continues, please contact your helpdesk.
Error message from one client;
From: Microsoft Outlook
Sent: Monday, February 17, 2014 1:24 PM
To:user@user.domain.com
Subject: Undeliverable: test
xlspam03.mdcs.at rejected your message to the following email addresses:
user@user.domain.com
xlspam03.mdcs.at gave this error:
#5.7.1 Your access to submit messages to this e-mail system has been rejected.
A problem occurred while delivering this message to this email address. Try sending this message again. If the problem continues, please contact your helpdesk.
Thanks in advance for your help.