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I'm experiencing an inconsistent issue with email links and buttons not working for some recipients when sending emails through SendGrid using Node.js and Handlebars templates.

Issue Description

Some recipients cannot interact with links and buttons in our emails, while others can click them without issues. This happens with:

  • Both regular hyperlinks and HTML buttons in the same email
  • The exact same email (verified by CC'ing working/non-working recipients)
  • Template system that works perfectly in other applications we maintain

Observed Behavior

  • For some recipients: Links/buttons are completely invisible (observed in iCloud Mail)
  • For other recipients: Links/buttons are visible but not clickable
  • For working recipients: Everything functions as expected

Environment

  • Using Node.js with SendGrid for email delivery
  • Handlebars (.hbs) templates for email content
  • Domain properly verified with SendGrid records
  • No correlation found between specific:
    • Phone types
    • Email client versions
    • Email clients

Template Example

<!-- Simplified version of our working template -->
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <style>
        .button {
            background-color: #f57c00;
            color: white;
            padding: 10px 20px;
            text-decoration: none;
            border-radius: 5px;
            display: inline-block;
        }
    </style>
</head>
<body>
    <div>
        <p>Example content</p>
        <!-- Button example -->
        <div>
            <a href="{{linkUrl}}" target="_blank" class="button" style="color: white; text-decoration: none;">
                Click Here
            </a>
        </div>
        <!-- Regular link example -->
        <p>Or click <a href="{{linkUrl}}" target="_blank">here</a></p>
    </div>
</body>
</html>

What we've verified

Links are valid (confirmed through CC'd support email) Template works in other applications using identical setup No common denominator found among affected users Domain verification is correct in SendGrid

Questions

Could this be related to domain / dns level stuff?

Any insights or suggestions would be greatly appreciated.

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