Why API Email Still Relies on SMTP
from My Weird Prompts
Developer email services like Resend seem to replace decades-old protocols with a simple HTTPS POST, but the transport layer remains entirely intact underneath. Modern API mail platforms handle queues, connection pools, and MTA operations like bounce classification and retries behind the curtain. While open-source projects now build personal inboxes on top of these APIs, DNS setup, port blocks, and inbox archiving reveal why transactional mail interfaces still struggle to become everyday mailboxes. Key sources: • Resend docs, Introduction — https://resend.com/docs/introduction • Resend docs, Send emails with SMTP — https://resend.com/docs/send-with-smtp • Resend engineering handbook, What is our tech stack — https://resend.com/handbook/engineering/what-is-our-tech-stack Episode 6394 — myweirdprompts.com/n/6394 (permanent short link: myweirdprompts.com/663835) Listen on Android: MWP FM Player — myweirdprompts.com/apk
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