Multi-Channel Notification Strategy

Reaching users across email, SMS, push, and in-app requires more than just sending messages everywhere. Here's how to coordinate channels effectively.

The Multi-Channel Challenge

Users are everywhere - checking email on desktop, getting push notifications on mobile, seeing SMS on their watch. The temptation is to blast messages across all channels. But that leads to:

• Notification fatigue: Users tune out or unsubscribe
• Poor experience: The same message three times feels spammy
• Wasted spend: SMS costs money, don't waste it

The solution? A coordinated strategy that uses each channel for what it does best.

Channel Strengths

Email

Best for: Detailed content, visual messages, non-urgent updates

• Pros: Rich formatting, no character limits, low cost
• Cons: Slow to open (hours), easy to ignore
• Use for: Receipts, newsletters, detailed updates

SMS

Best for: Urgent, time-sensitive messages

• Pros: 98% open rate, read within 3 minutes
• Cons: Expensive, character limits, requires opt-in
• Use for: OTP codes, critical alerts, flash sales

Push Notifications

Best for: Real-time engagement, bringing users back to app

• Pros: Instant delivery, free, rich media support
• Cons: Easy to disable, limited reach
• Use for: Social updates, activity alerts, time-sensitive deals

In-App Messages

Best for: Contextual guidance, feature announcements

• Pros: Highest engagement, no opt-in needed
• Cons: Only reaches active users
• Use for: Onboarding, new features, upsells

Coordination Strategies

Strategy 1: Escalation

Start with the least intrusive channel, escalate if no response:

Strategy 2: Channel Preference

Let users choose their preferred channel:

12345678await fbf.identify({  userId: 'user-123',  traits: {    preferredChannel: 'push',    emailOptIn: true,    smsOptIn: false  }});

Then in your workflow condition:

1user.preferredChannel == "push" || user.preferredChannel == "email"

Strategy 3: Message Type Routing

Route based on message urgency and type:

Building a Multi-Channel Workflow

Here's a real example - a flash sale notification:

12345678910111213141516171819202122232425262728293031{  "trigger": "flash_sale.started",  "actions": [    {      "type": "notify",      "channel": "push",      "title": "Flash Sale! 50% off",      "body": "24 hours only. Shop now →"    },    {      "type": "wait",      "duration": 3600    },    {      "type": "notify",      "channel": "email",      "template": "flash-sale",      "condition": "!user.hasOpenedPush"    },    {      "type": "wait",      "duration": 14400    },    {      "type": "notify",      "channel": "sms",      "message": "Flash sale ends in 6 hours! 50% off everything: {{saleUrl}}",      "condition": "user.smsOptIn && !user.hasPurchased"    }  ]}

Avoiding Common Mistakes

1. Don't Over-Communicate

Rule of thumb: If you wouldn't want to receive it, don't send it.

2. Respect Time Zones

Don't send push notifications at 3 AM.

12// Only send during reasonable hoursuser.localHour >= 9 && user.localHour <= 21

3. Deduplicate Messages

If you send an email, don't send the same content via push.

4. Honor Preferences

If a user opts out of SMS, don't try to work around it.

Measuring Channel Performance

Track per channel:

• Delivery rate: Did it reach them?
• Open/read rate: Did they see it?
• Click rate: Did they engage?
• Conversion rate: Did they take action?

Use this data to optimize which channels you use for which messages.

Getting Started

1. Audit your current notifications
2. Categorize by urgency and type
3. Assign primary channels
4. Build fallback logic
5. Test and iterate

Start building your multi-channel strategy →