You need to make sure there exists a user email@example.com with privileges to the database mysql.
If you have access to the mysql instance another way, do the following to see what privileges this user has:
show grants for root@'192.168.1.65';
The results should look something like the following:
grant all privileges on mysql.* to 'root'@'192.168.1.65' identified by password 'XXXX';
If you don't see results for that "show" statement above, then use the "grant" statement above to give the privileges.
If the IP address you are connecting from changes often, you can open it up to the wildcard host %, like:
grant all privileges on mysql.* to 'root'@'%' identified by password 'XXXX';
but that's not terribly secure.
(If you don't have access, ask your DBA/webhost to do that.)
Then you can connect using that statement, but add the -p flag so you can enter your password:
mysql -u root -p -h 192.168.1.181 -e "use mysql;"