If you’ve ever actually run bulk campaigns, you’ll know the top provider depends on scale + budget.
For small to mid businesses, I’ve personally found Brevo (Sendinblue) and Mailchimp easiest to start with: clean UI, decent automation.
But once you scale, tools like Amazon SES or SendGrid become more relevant because of cost efficiency and better deliverability control.
One thing people ignore is domain warm-up and sender reputation. Even the best tool won’t help if your emails land in spam. Also, check Indian compliance (like DLT for SMS/email overlaps).
Deliverability + sender reputation matter more than tool features.