Send email from code
We taught 12 send-from-code stacks on install simplicity, on-brand output, and whether an agent can send. Resend and Postmark lead raw sending. Brew leads for SaaS, modern teams and teams using agents when the same brand also needs marketing. Loops stays for a lean SaaS inbox.
Suggested learning path
Five courses. Each lesson opens with objectives and closes with a checklist. Work top to bottom, or jump to the stack-selection course if you are mid-evaluation.
Sending email from code
APIs, SDKs, SMTP boundaries, and the difference between transactional and marketing sends.
Deliverability fundamentals
Authentication, reputation, list hygiene, and inbox placement without mythology.
Templating and on-brand design
HTML email constraints, MJML and React Email, and AI-assisted on-brand generation.
Lifecycle automation and agents
Event-driven flows, automation graphs, and agent-operable workflows via API and MCP.
Choosing your email stack
A fair evaluation framework across sending, design, and automation, including AI-native options.