Member Avatar for gikonyo

please advise on how to go about implementing pop up messages on a web based system. where by a user logs in to the system using the email address and when logged in he/she can be notified on incoming emails.
how can i capture incoming emails and implement a pop up message that alerts the user.

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As pointed out, a backend must detect incoming mail and a realtime channel must inform the logged session. Three practical patterns (sorted by modern best practice) with implementation notes follow.

  • Inbound webhook (recommended): configure an incoming-mail provider (SendGrid, Mailgun, Amazon SES, etc.) to POST mail to the application. The server validates the request, extracts headers/metadata, and emits a realtime event to the user session (WebSocket or SSE). This avoids storing mailbox passwords and scales well — see SendGrid inbound parse for an example of this pattern (SendGrid inbound parse docs).

  • Mailbox connection (push/fallback): keep a secure IMAP connection using IDLE to receive server-side notifications when new messages arrive; fetch headers on notification. For providers such as Gmail or Outlook, use OAuth2 for authentication. For Node.js, the node-imap project is a common starting point (node-imap on GitHub). Polling (periodic checks) works as a fallback but must use UID-based checks and conservative intervals to avoid rate limits.

  • Browser delivery: push events from server to browser via WebSocket or Server-Sent Events, then show an in-page toast or a system popup with the Notifications API (Notifications API on MDN). Minimal event flow:

# server receives new-mail (webhook or IMAP)
ws.broadcast(userId, {from, subject, snippet});

# client
ws.onmessage = (e) => {
  const d = JSON.parse(e.data);
  new Notification(d.subject, {body: d.snippet});
};

Cautions: always use TLS, avoid storing raw mailbox credentials (use OAuth where supported), respect provider rate limits and terms, and validate inbound webhook signatures before trusting payloads.

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Member Avatar for pritaeas

The server would need to poll the mail server, probably using pop or imap. The web application also needs to poll the server, to be able to inform the user if a new message was received.

Member Avatar for gikonyo

How do you go about implementing poll or imap?

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