On 2016-10-13 08:30, vod vos wrote:

Oct 12 14:38:50 postfix/smtpd[1877]: warning: hostname
4d1q192.urbanchipps.net does not resolve to address 104.200.137.192:
Name or service not known


are these spams, how can I do? thanks.

no its more just a badly configured mailserver that have not performed fully qualified dns reverse name for that ip

basic:

host <ip>
dig <ptr>

does not match same ip vs ptr

and you cant do anything to it

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