Thanks Marcos,
We have ESET Remote Administrator (Server), Version 6.5.
I made sure that License expiration notification is Disabled in ESET remote administrator console, and this is not stopping the actual email notification which is sent to root@*********** . account. I have tried making the license script (scripts/license_warning_script ) not to execute in the linux host were the ESET is hosted. Still it didn't fix the issue.