What is a notification email?

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A notification email is an automated message that alerts you when something happens. Someone commented on your post. Your package shipped. A file finished uploading. Your account logged in from a new device. These are notifications.

Notification emails are a subset of transactional email. They're triggered by events (not campaigns), sent one-to-one (not to a list), and their purpose is situational awareness rather than completing a transaction. You didn't ask for the email directly, but something happened that you probably want to know about.

Common notification types:

Social activity: new follower, comment reply, mention, friend request
Account security: login from new device, password changed, two-factor code
Status updates: order shipped, file processed, backup completed, payment received
System alerts: server down, quota exceeded, subscription expiring soon
Content updates: new post from someone you follow, document shared with you, calendar invitation

The trickiest part of notification emails is volume control. Apps that send too many notifications train users to ignore them (or unsubscribe entirely). Intercom, Slack, and GitHub all let users customize which notifications they receive and how often. That's not optional for apps with high notification volume. It's survival.

Notification emails should be instant (or near-instant). If someone tags you in a comment, that email should arrive in seconds, not hours. That's why most notification emails are sent through transactional ESPs like Postmark, SendGrid, or Customer.io rather than marketing platforms. Marketing ESPs batch sends to optimize throughput. Transactional ESPs prioritize speed.

One mistake that kills notification deliverability: bundling them with marketing campaigns on the same sending stream. If your app sends "New comment on your post" emails through the same infrastructure that sends "Check out our new features!" newsletters, a single marketing campaign with high complaint rates can land your login alerts in spam. Keep notification email on a separate sending domain (or subdomain) from marketing. This is called stream separation, and it's not optional if you care about transactional deliverability.

If you're building an app that sends notifications, give users control over what they receive. And if you're troubleshooting notification delivery, check your authentication records first (notifications@yourapp.com needs its own SPF/DKIM setup). You can verify your setup with our free SPF checker, or just ask us if something's not working.

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Yanna-Torry (YT) Aspraki

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I read this on the Email Almanac about notification emails: "A notification email alerts you when something happens. Someone commented on your post. Your package shipped. A file finished uploading. Your account logged in from a new device. Notifications are a subset of transactional email, triggered by events rather than campaigns." Help me understand how this applies to MY app or system. I need: 1. Which events in my app should trigger notification emails (and which shouldn't) 2. How to give users control over notification frequency without overwhelming them 3. Whether I need a separate sending domain for notifications vs marketing 4. How to verify my notification emails won't land in spam --- My details (the more you share, the better the advice): - Platform/ESP: e.g. Postmark, SendGrid, Customer.io, custom SMTP - App type: e.g. SaaS, social network, e-commerce, content platform - Notification types I'm sending: e.g. comments, logins, shipments, alerts - Current volume: e.g. 1,000 notifications/day - Do I also send marketing email?: yes/no, same domain or separate? - Biggest challenge: [e.g. users ignoring notifications, emails going to spam, too many complaints]

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