sendmail[]: can't lookup data via name server "dns" or sendmail[]: can't lookup data via name server "nis"

Cause

The following entry in the /etc/nsswitch.conf file: sendmailvars: dns nis files causes the messages to appear in the console window.

Action

The sendmailvars database can only be used with local files and/or NIS+. So, if you do not have this database setup, the default sendmailvars entry should look as follows in the /etc/nsswitch.conf file:

sendmailvars: files