The answer
Sender's name and photo, a preview of the message (first 100 characters), a 'Reply Now' button linking to the chat URL, and the app branding. Use inline CSS (email-safe HTML) and include a plain text fallback.
Chat Notifications for Offline Users Email and Push Notifications
What should the chat email notification include?
More FAQs in Chat Notifications for Offline Users Email and Push Notifications
Maintain a Map of online users. When a message is sent, check if the receiver is online. If not, send an email notification with the sender's name, message preview, and a link to the chat. Rate-limit to 1 email per 10 minutes and respect user notification preferences.
Request Notification.permission on first visit. When a message is received via Socket.io and the tab is hidden (document.hidden), create a new Notification with the sender's name, message text, and icon. Handle notificationclick to open the chat URL.
Check NotificationLog for a recent notification (within 10 minutes) before sending. If one exists, skip. Also respect user preferences (notificationPreferences.messageEmail). Don't send to bounced or complained emails. Log each notification sent.
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