How do CDNs serve images securely (HTTPS, caching)?

A Content Delivery Network (CDN) distributes your images across global servers, serving them from locations closest to recipients. This reduces load times and provides reliability. HTTPS is mandatory-modern email clients warn about or block mixed content (HTTP images in HTTPS contexts).

CDN benefits: Speed-images load from nearby servers. Reliability-multiple server redundancy prevents outages. Security-HTTPS encryption, DDoS protection. Caching-repeated views load from cache, reducing bandwidth. Scalability-handles traffic spikes from large sends.

Use HTTPS exclusively. HTTP image URLs will display warnings or break in many clients. Most CDNs provide HTTPS by default. If using your own hosting, configure SSL certificates properly. Image security isn't optional anymore-it's table stakes for professional email sending.

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