it's a remote system. I think it's one of the emails that were sent... and this warning was present after sending the mail EDIT: i think i found...
I do, my resolv.conf: nameserver 8.8.8.8 nameserver 8.8.4.4
Hello, In my log I see a lot of warnings like this: Nov 4 11:42:28 backupserver postfix/smtpd[22340]: warning: 213.56.159.12: hostname...
Separate names with a comma.
