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Designing signatures

Hosting your own images

Images in email must be publicly reachable over HTTPS with no authentication and no hotlink protection.

Current service scope: HTML creation and guided installation are available. Transport stamping and on-premises agents are not available; directory connectivity does not deploy outgoing signatures. Review service limitations.

4 min read

Using your own host

  1. 1Upload the image to your CDN or website.
  2. 2Confirm it loads in a private browser window with no cookies.
  3. 3Paste the absolute https:// URL into the image field in the builder.

Never point at a Google Drive, Dropbox or SharePoint preview link — they expire or require sign-in.

Managed hosting add-on

If you would rather not manage this, the managed image hosting add-on takes an upload, resizes it for retina screens, serves WebP with a PNG fallback and gives you a permanent URL.

Next guideSocial icons: styles, links and tracking