In my ISPConfig 3 logs, under mail warnings - logs, I get entries like the following all the time. I would like confirmation that these entries are postfix et al blocking or warning about incoming spam into the server. I WANT TO VERIFY THAT THESE ARE NOT ENTRIES PERTAINING TO OUTGOING MAIL - MAIL BEING SENT BY THE SERVER - THAT WOULD MEAN A HACKER HAS CONTROL OF OUR MAILSERVER OR SERVER. Thanks for help understanding. Sep 26 21:23:54 server1 postfix/smtpd[32400]: warning: hostname adsl190-26175175.dyn.etb.net.co does not resolve to address 190.26.175.175: No address associated with hostname Sep 26 21:24:04 server1 postfix/smtpd[32152]: warning: hostname adsl190-26175175.dyn.etb.net.co does not resolve to address 190.26.175.175: No address associated with hostname Sep 26 21:31:34 server1 postfix/smtpd[32400]: warning: hostname static-adsl190-250-22-106.une.net.co does not resolve to address 190.250.22.106: No address associated with hostname Sep 26 21:41:11 server1 postfix/smtpd[32400]: warning: hostname bb4332c6.virtua.com.br does not resolve to address 187.67.50.198: No address associated with hostname Sep 26 21:43:52 server1 postfix/smtpd[32400]: warning: hostname 250.190-155-201.uio.satnet.net does not resolve to address 190.155.201.250: No address associated with hostname Sep 26 21:44:28 server1 postfix/smtpd[32400]: warning: hostname 250.190-155-201.uio.satnet.net does not resolve to address 190.155.201.250: No address associated with hostname Sep 26 21:44:47 server1 postfix/smtpd[32400]: warning: hostname 146-181-191-190.cab.prima.net.ar does not resolve to address 190.191.181.146: No address associated with hostname Thanks for clarifying this. E
Hello, Just warnings from connections to your mail server. This warning is logged because the remote client have "poor" dns configuration. However you should check your logs and see the full history and not only the connection. For example: Code: grep 190.191.181.146 /var/log/mail.log If you need more help just paste here some results. Cheers!
