A good percentage rate of opened emails for a campaign ranges from 15% to 25%. You should aim for this range to ensure engagement. Some industries achieve higher open rates of 30% or more. You must track your own data to understand what works for your audience. You should focus on writing attractive subject lines to improve your rate. You must send emails at times when your audience is most active. You can segment your email list for better targeting. You should clean your list regularly to remove inactive subscribers. Monitoring your open rate helps refine your email campaigns.