Engineering Deep Dive: How Temp-Mail.im Delivers Emails in Sub-Seconds

The Architecture Behind Sub-Second Deliverability

How does Temp-Mail.im deliver incoming emails to your browser tab in under 2 seconds while handling millions of daily messages? Here is our high-performance architecture:

• Custom Go MTA Cluster: Lightweight edge mail servers accept incoming SMTP packets with zero connection overhead.
• In-Memory Redis Pub/Sub: Messages are parsed and broadcast across a distributed Redis event bus in under 15ms.
• Persistent WebSocket Stream: Active client browser tabs receive real-time JSON push payloads without polling lag.
• Automatic 24-Hour RAM Eviction: Volatile cache nodes purge expired mailboxes automatically, keeping memory usage ultra-lean.