Scenario

When creating an event in Netsuite, after adding a new attendee, the Email checkbox is automatically ticked. User would like to know if there a way to have it always be set to unchecked.

Solution

There is no option to set the Email field as unmarked by default. This is explained in the following SuiteAnswers article:36505 Deselecting Notify Attendees by Email Still Sends Out Emails to Event Attendees

The only way you can clear the Email checkbox when attendees are added is by marking and then unmarking the following checkbox:

However, email notifications will still be sent out based on the user preference set in Home > Set Preferences > Activities tab > Send Invitation Emails.