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Email blocked issue

Discussion in 'E-mail Discussions' started by trec-r, Jan 16, 2016.

  1. trec-r

    trec-r Active Member

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    Recently switched to a new dedicated server and was shocked that all my emails are now getting blocked by Microsoft(outlook.com, hotmail, and others.) At first we found out the issue was a bad PTR. After we fixed that issue the problem went away. Now my emails are getting blocked again. Below is what I am getting from Microsoft, I have changed the IP addresses, email address, and domain names.

    Code:
    This message was created automatically by mail delivery software.
    
    A message that you sent could not be delivered to one or more of its
    recipients. This is a permanent error. The following address(es) failed:
    
      mytestaddresson@outlook.com
        host mx3.hotmail.com [65.55.37.120]
        SMTP error from remote mail server after MAIL FROM:<mail@domain.com> SIZE=2062:
        550 SC-001 (COL004-MC4F44) Unfortunately, messages from 255.255.255.255 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.
    
    
    
    Reporting-MTA: dns; hostname.domain.com
    
    Action: failed
    Final-Recipient: rfc822;mytestaddresson@outlook.com
    Status: 5.0.0
    Remote-MTA: dns; mx3.hotmail.com
    Diagnostic-Code: smtp; 550 SC-001 (COL004-MC4F44) Unfortunately, messages from 255.255.255.255 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.
    
    Any ideas on the cause of this?
     
  2. syslint

    syslint Well-Known Member

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    Twitter:
    These public email services may limit the emails from certain Ips, if theysend massive emails. Please check your server mail sending status from each account. Aslo providers like google will have specific options for settings up mass mail domains. You may check the SPF and DKIM configurations of your domain too. Probably that will be missed during dns update time.
     
    Gil Dimaapi likes this.
  3. cPanelMichael

    cPanelMichael Forums Analyst
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  4. trec-r

    trec-r Active Member

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    The issue has been resolved. The problem was caused by not having any reputation with the new IP addresses. I requested that they be delisted using this page support.microsoft.com

    To monitor the IP addresses I created an account here postmaster.live.com/snds/index.aspx
     
    #4 trec-r, Jan 19, 2016
    Last edited by a moderator: Jan 19, 2016
  5. cPanelMichael

    cPanelMichael Forums Analyst
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