If you have not set up DKIM and an email domain, you are limited to 10,000 messages per campaign.
Your system administrator can set up DKIM and campaign email domains. Your company must first purchase a domain from a domain provider like GoDaddy.com or Network Solutions. DKIM and email domains are required to send more than 10,000 email messages per campaign (email merge), or more than 100,000 bulk email per month.
If you have DKIM set up, there is no limit to the number of email messages you can send in a single merge or campaign. The only limit is the monthly allotment of email messages you have purchased. Email that is sent by NetSuite servers is counted toward your monthly allotment even if it does not reach its target recipient.
Subscription opt-in email does not count against your monthly email allotment.