Most businesses treat email like one giant pipeline. Businesses push promotional campaigns, password resets, invoices, OTPs, onboarding emails, and account alerts through the same system together. It feels easier in the beginning. Then suddenly, important emails start landing in spam folders, and customers begin complaining they never received critical updates. That is exactly why businesses are now turning to Sinch email API solutions to separate transactional and marketing communication before deliverability problems become expensive. Not Every Email Should Be Treated the Same Think about the difference between a discount email and a password reset request. One is optional. The other is urgent. Marketing campaigns naturally generate unsubscribes, ignored messages, and spam complaints. That is completely normal. However, when those campaigns share the same sending reputation as transactional emails, even crucial communication begins to suffer....