i sent an email campaign and the group i created had 8900 contacts, but when i sent it i noticed that netsuite sent only 7200 emails. Some contacts that didnt experience bounces before didnt receive an email. any idea why the campaign didnt send an email to everyone on that list?

you can check the sent email list (despite the name, it also includes unsent emails) - often even if an email isn't bounced, it may still not go through due to other spam protections