Postfix allows you to send emails and that's all. Imagine a retail business that relies on emails to get information on what's next: what are the most popular

Postfix allows you to send emails and that's all. Imagine a retail business that relies on emails to get information on what's next: what are the most popular products, what's a good tag line, which segment of its customers are interested by what, who is most likely to buy. Sendgrid allows you to add A/B testing, scheduling (send a % of emails at a specific hour), track who opened emails when, track who unsubsucribed. If you are doing simple emails like email confirmation or simple user reminder, these features are totally overkill. But email has still the best ROI for many businesses and thats why they need sendgrid