Issue
Files uploaded to Marketo's Design Studio, like PDFs or image files, are assigned an HTTP URL instead of HTTPS. This discrepancy can trigger security warnings in emails, as modern browsers and mail clients expect secure links that match the SSL certificate's domain.
Solution
To address this issue, follow these steps:
- Ensure you have a custom landing page rather than the default domain. See under Admin > Landing Pages.
- Apply an SSL certificate to any new domains added. Marketo won't do this automatically. You can contact Marketo Support to request an SSL application for your domain. Provide necessary details.
- After SSL implementation, send test emails to check for proper HTTPS encryption and the absence of security warnings.
By implementing these actions, asset URLs and landing pages in Marketo communications should be secure.
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