"nginxlookup - user not found" Brute force

[yeeP6rai]

Hi,

Release 8.8.15_GA_3829.RHEL7_64_20190718141144 RHEL7_64 FOSS edition, Patch 8.8.15_P2

What mean this messages?

Code: Select all

2019-10-17 00:01:06,763 INFO  [qtp1010670443-319130:https://ZIMBRA_IP/service/extension/nginx-lookup] [] nginxlookup - user not found:haolovefang@mydomain.com
2019-10-17 00:01:06,808 INFO  [qtp1010670443-319858:https://ZIMBRA_IP/service/extension/nginx-lookup] [] nginxlookup - user not found:haoloveminmin@mydomain.com
2019-10-17 00:01:08,799 INFO  [qtp1010670443-319856:https://ZIMBRA_IP/service/extension/nginx-lookup] [] nginxlookup - user not found:haolover@mydomain.com
2019-10-17 00:01:08,825 INFO  [qtp1010670443-319637:https://ZIMBRA_IP/service/extension/nginx-lookup] [] nginxlookup - user not found:haolovewen@mydomain.com
2019-10-17 00:01:08,844 INFO  [qtp1010670443-319611:https://ZIMBRA_IP/service/extension/nginx-lookup] [] nginxlookup - user not found:haolu@mydomain.com
2019-10-17 00:01:08,861 INFO  [qtp1010670443-319858:https://ZIMBRA_IP/service/extension/nginx-lookup] [] nginxlookup - user not found:haoluntan@mydomain.com
2019-10-17 00:01:09,759 INFO  [qtp1010670443-319856:https://ZIMBRA_IP/service/extension/nginx-lookup] [] nginxlookup - user not found:haoluogaga@mydomain.com
2019-10-17 00:01:09,784 INFO  [qtp1010670443-319130:https://ZIMBRA_IP/service/extension/nginx-lookup] [] nginxlookup - user not found:haolunxie@mydomain.com
2019-10-17 00:01:12,818 INFO  [qtp1010670443-319449:https://ZIMBRA_IP/service/extension/nginx-lookup] [] nginxlookup - user not found:haolyon@mydomain.com
2019-10-17 00:01:12,834 INFO  [qtp1010670443-319858:https://ZIMBRA_IP/service/extension/nginx-lookup] [] nginxlookup - user not found:haolvyuan@mydomain.com

And why it's possible or is it critical?