Realtime vs Polling for Temporary Email Inboxes
Separate mail arrival from the mechanism a browser uses to discover and display new messages.
This is an update mechanism, not an email transport
Realtime connections and polling both help a browser discover that the receiving application has new data. Neither mechanism replaces SMTP or makes an external sender dispatch a message sooner.
Polling asks repeatedly
The browser requests the latest inbox state on an interval or after an action. It is simple and resilient but can do unnecessary work when nothing changed.
Realtime pushes a signal
A persistent connection can notify the active client when the server knows about a new message, reducing the delay between application receipt and interface update.
Fallback keeps the inbox usable
Realtime connections can fail because of network changes, proxies or browser state. A polling fallback gives the product another path to recover the current inbox without making the user manually reload every message.
Measure the right latency
Sender-to-server delivery and server-to-browser notification are separate clocks. Realtime improves the second one, not the first.
See the receiving flow from the user side
Create a temporary inbox and watch how a real message moves from sender timing to inbox arrival and browser update.
Create temporary emailRelated technical guides
Continue with the system layer closest to the question you are investigating.