I am using a shared host from JustHost.com that comes with an email service.

When sending an email to some email address using my address myname@mydomain.com, I got a message saying that my email was rejected, as below.

This is the mail system at host gproxy8.mail.unifiedlayer.com.

I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can delete your own text from the attached returned message.

               The mail system

: host mail.adfiap.org[] said: 550-5.5.1 Server IP listed as abusive. See 550-http://spamauditor.org/best-practices/ip-reputation/ for more information.. 550 Protection provided by MagicSpam 2.1-9.1 http://www.magicspam.com (in reply to RCPT TO command)

The most important information from the above message is perhaps Server IP listed as abusive. The problem is that I don't know where this IP address comes from. The SMTP server I used is just164.justhost.com, which resolves to IP address (as given by this tool).

Could anybody please help me to understand what actually happened and how to resolve this?

Thank you very much in advance for your help!

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