Deploying an Email Infrastructure on AWS

How we built a production-ready, programmable temporary email platform using FastAPI, aiosmtpd, Redis, and Terraform. 1. Introduction Receiving emails programmatically is deceptively hard. Sending email is a solved problem — you call an API, provide credentials, and a third-party handles everything. Receiving email is a different challenge entirely. To receive email, you need a listening SMTP server, an MX DNS record pointing at it, a strategy for spam filtering, a mechanism to parse RFC 2822 messages reliably, a way to route incoming messages to the right user or process, and a real-time notification layer so that waiting clients know when something arrived. And all of that has to survive production traffic without a single SMTP connection timing out. This article walks through the full architecture of uncorreotemporal.com , a programmable temporary email platform. The platform lets developers and automation systems create disposable inboxes, receive real emails, and access them via a