What is the best way to send a promotional email to 50,000 emails?

What free tools can I use to send promotional emails to 50,000 email IDs, with a maximum of 2-5K emails sent daily?

To send promotional emails to 50,000 email addresses for free, you can consider using Mailchimp. They offer a free plan that allows you to send up to 10,000 emails per month to a maximum of 2,000 subscribers. However, if you want to send 2,000-5,000 emails daily, you will need to upgrade to one of their paid plans. Mailchimp offers a range of paid plans with different features and pricing options. Additionally, there are other email marketing tools available that offer free plans or free trials, such as Sendinblue and MailerLite. It’s important to research and compare different tools to find the one that best fits your needs and budget.