Mail Sender IP Address is listed in the CBL

My mail sender was listed at the spam blacklist for several weeks, and finall I found the solution: configured the hosts properly, and replaced the “localhost.localdomain” with ””

mailserver localhost.localdomain  localhost
mailserver localhost
The below is the information from

IP Address 1xx.1xx.100.1xx is listed in the CBL. It shows signs of being infected with a spam sending trojan, malicious link or some other form of botnet.

It was last detected at 2017-04-10 12:00 GMT (+/- 30 minutes), approximately 1 days, 4 hours, 59 minutes ago.

It has been relisted following a previous removal at 2017-04-07 07:39 GMT (4 days, 8 hours, 56 minutes ago)

This IP address is HELO’ing as “localhost.localdomain” which violates the relevant standards (specifically: RFC5321).

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