Email Signature Image Hosting

Email signature image hosting is the infrastructure that serves the images referenced in a signature (company logo, employee profile photo, social media icons, banner campaign image). Because the signature HTML uses `<img src>` tags pointing to absolute URLs, the recipient's email client loads each image on email open. The hosting needs to be a stable URL (no path changes that break old emails), a fast CDN (slow image loads delay the signature render), HTTPS only (mixed content blocks the image in many clients), reasonable file sizes (under 50KB per image so signatures load on weak mobile connections), and cache-aware (long max-age headers so frequent recipients do not re-download the same logo). Embedded base64 images are an alternative but inflate email size and trigger spam filters when used heavily. Signature platforms typically host all signature images on their own CDN, removing this concern for customers.