There still many many logs in /var/log/mail.log

How can I eliminate or ignore this kind of logs if doing this do not harm mail 

---- On 星期四, 13 十月 2016 00:02:45 -0700Benny Pedersen <> wrote 

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


> Oct 12 14:38:50 postfix/smtpd[1877]: warning: hostname 

> does not resolve to address 

> 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 




host <ip> 

dig <ptr> 


does not match same ip vs ptr 


and you cant do anything to it 

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