Hello guys,
when I cat /var/log/mail.log | grep warn It shows Oct 12 14:20:55 postfix/smtpd[2431]: warning: hostname static-bbs-74-184-3-210-on-nets.com does not resolve to address 210.3.184.74: Name or service not known 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 and many many of such logs. are these spams, how can I do? thanks. sincerely yours
