The number of emails you can send to your newsletter in a day depends on your email service provider. Most platforms like Mailchimp or Sendinblue have daily sending limits based on your subscription plan. Free plans often limit daily emails, such as 500 to 2,000 per day. Paid planfs allow higher or unlimited sending volumes. You should check your provider's policy to confirm limits. Sending too many emails at once may affect deliverability. You should also avoid overwhelming your audience with excessive emails. Focus on quality over quantity to maintain engagement and ensure successful campaigns.