This task can be performed using Lemón Simple Email Service
Convert free user into paid with AI-friendly email API
Best product for this task

Lemón Simple Email Service
marketing
From "meh" emails to "omg, they get me!". Easy and simple RestAPI to trigger email dynamically with your AI-generated content at run time. If you're doing something with AI/ML/LLM for your SaaS, then Lemón Email is perfect for you. But if you are simply looking for a generic email API/SMTP, you should use Sendgrid, Mailgun, or Amazon SES.

What to expect from an ideal product
- Send personalized AI-generated emails through a simple REST API call
- Get your email content from any LLM and plug it into dynamic templates
- Works smoothly with real-time AI content generation for immediate sending
- Built specifically for applications using AI/LLM-generated content
- Handles the email delivery while you focus on crafting the perfect AI message