Hi! I was recently looking for a similar solution for sending emails to India, and I can recommend https://www.massmailsoftware.com/india/bulkmail/. They provide bulk email services and have a good reputation. I have used their platform and have been pleased with the results. You will find many features on the site that may be useful for your project. They offer the ability to download a large number of recipient addresses, customization of personalized email templates, delivery tracking, and mailing statistics. They also have great technical support if you have any questions or problems.