Fintech Email Campaigns with Deep Links

Fintech apps send more transactional emails than almost any other category: balance alerts, transaction confirmations, statement notifications, security alerts, and promotional offers. Each email is an opportunity to bring the user back to the app. But without deep links, clicking a link in an email opens the mobile website (where the user probably is not logged in) instead of the app (where they are).

This guide covers how to build fintech email campaigns with deep links that open the right screen in the app. For Universal Links in email, see Universal Links in email. For e-commerce email deep links, see e-commerce email deep links.

The Email-to-App Problem

When a fintech user taps a link in an email on their phone:

Without deep links:

1. Email link opens the mobile website.
2. User is not logged in on the mobile web.
3. User must log in (enter email, password, 2FA).
4. User navigates to the relevant page.
5. Most users abandon at step 3.

With deep links:

1. Email link opens the app directly to the relevant screen.
2. User is already authenticated in the app.
3. User sees the content immediately.

The difference in engagement is significant. Deep-linked emails in fintech see 2-3x higher tap-through rates because users know the link will open the app, not a mobile web login page.

Email Categories and Deep Link Patterns

Transactional Emails

These are triggered by user actions or system events:

Transaction Alert

<p>You spent $45.00 at Whole Foods on July 5.</p>
<a href="https://links.finapp.com/transactions/TXN-12345">
  View Transaction
</a>

Direct Deposit Received

<p>Your direct deposit of $3,200.00 from Acme Corp has been received.</p>
<a href="https://links.finapp.com/accounts/ACC-789/transactions">
  View Account
</a>

Card Frozen Alert

<p>Your card ending in 4589 has been temporarily frozen due to unusual activity.</p>
<p>If this was you, you can unfreeze your card in the app.</p>
<a href="https://links.finapp.com/cards/CARD-456">
  Review Card Activity
</a>

Statement Ready

<p>Your July 2026 statement is ready.</p>
<a href="https://links.finapp.com/accounts/ACC-789/statements">
  View Statement
</a>

Lifecycle Emails

These guide users through the onboarding and engagement funnel:

Complete Your Profile

<p>You're almost done setting up your account. Add your phone number to enable notifications.</p>
<a href="https://links.finapp.com/settings/profile">
  Complete Setup
</a>

Set Up Direct Deposit

<p>Get paid up to 2 days early with direct deposit.</p>
<a href="https://links.finapp.com/direct-deposit">
  Set Up Direct Deposit
</a>

Activate Your Card

<p>Your new debit card has arrived. Activate it now to start using it.</p>
<a href="https://links.finapp.com/cards/CARD-789/activate">
  Activate Card
</a>

Promotional Emails

These promote features and offers:

New Feature: Round-Up Savings

<p>Introducing Round-Up Savings. Every purchase rounds up, and the spare change goes to savings.</p>
<a href="https://links.finapp.com/savings/round-ups">
  Enable Round-Ups
</a>

Referral Program

<p>Give $25, get $25. Share your referral link with friends.</p>
<a href="https://links.finapp.com/referrals">
  Share Your Link
</a>

Savings Goal Milestone

<p>You're 75% of the way to your vacation savings goal!</p>
<a href="https://links.finapp.com/savings/GOAL-123">
  View Progress
</a>

Email Client Considerations

Universal Link Behavior in Email Clients

Not all email clients handle Universal Links the same way:

Email Client	Universal Link Behavior
Apple Mail	Universal Links work natively
Gmail (iOS)	Opens in Gmail's in-app browser first. User may need to tap "Open in Safari" for Universal Link to trigger.
Gmail (Android)	App Links work if properly verified
Outlook (iOS)	Opens in Outlook's in-app browser. Limited Universal Link support.
Outlook (Android)	App Links work with some limitations
Yahoo Mail	Variable behavior across versions

Working Around In-App Browsers

Some email clients open links in an in-app browser instead of triggering the Universal Link. Workaround:

1. The deep link lands on a web fallback page.
2. The web fallback page detects the in-app browser.
3. It shows a prominent "Open in App" button.
4. The button uses a Universal Link that the in-app browser will handle correctly (or falls back to the app store).

Link Tracking and Universal Links

Email marketing platforms (SendGrid, Mailchimp, etc.) often wrap links for click tracking:

Original: https://links.finapp.com/accounts/ACC-789
Tracked:  https://email.sendgrid.net/track/click?u=abc123&url=https://links.finapp.com/accounts/ACC-789

This tracked URL breaks Universal Links because the domain (email.sendgrid.net) is not your app's domain.

Solutions:

1. Disable link tracking for deep links. Most ESPs allow excluding specific links from tracking.
2. Use your own tracking domain. Configure your ESP to track clicks through your domain.
3. Track in the app instead. When the app opens via a deep link, log the event to your analytics.

Security in Fintech Emails

Link Verification

Fintech emails are a target for phishing. Help users verify legitimate emails:

• Use a consistent sender domain (e.g., [email protected]).
• Use a consistent link domain (e.g., links.finapp.com).
• Never include sensitive data in the email link itself (account numbers, balances).
• Sign emails with DKIM and DMARC.

Authentication After Deep Link

Even when the deep link opens the app, require authentication for sensitive screens:

func handleEmailDeepLink(_ url: URL) {
    let route = parseRoute(url)

    // Determine auth level needed
    let authLevel = requiredAuthLevel(for: route)

    switch authLevel {
    case .none:
        navigateTo(route)
    case .login:
        if authManager.isAuthenticated {
            navigateTo(route)
        } else {
            pendingDeepLink = route
            showLogin()
        }
    case .biometric:
        requestBiometric { success in
            if success { navigateTo(route) }
        }
    }
}

Expiring Links

Some fintech email links should expire:

• Password reset links: expire after 30 minutes.
• Account verification links: expire after 24 hours.
• Promotional offer links: expire with the offer.

Include an expiration timestamp in the link and validate it when the app opens:

func validateLink(_ url: URL) -> Bool {
    guard let expiresParam = URLComponents(url: url, resolvingAgainstBaseURL: false)?
        .queryItems?.first(where: { $0.name == "expires" })?.value,
        let expiresTimestamp = Double(expiresParam) else {
        return true // No expiration
    }

    return Date().timeIntervalSince1970 < expiresTimestamp
}

Measuring Email Deep Link Performance

Track these metrics for each email campaign:

Metric	What It Measures
Email open rate	How many recipients opened the email
Click-through rate	How many tapped the deep link
App open rate	How many successfully opened the app
Action completion rate	How many completed the intended action (payment, activation, etc.)
Fallback rate	How many landed on the web fallback instead of the app

The gap between "click-through rate" and "app open rate" indicates how many users have the app but are not being deep linked correctly (likely due to in-app browser issues).

Tolinku for Fintech Emails

Tolinku deep links work in email campaigns. Links use your custom domain, route users to the app on mobile, and fall back to a web page on desktop. Configure routes in the Tolinku dashboard.

For Universal Links in email, see Universal Links in email. For fintech deep linking, see deep linking for fintech and banking apps.