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Shortwave Image Fetcher

An email client that proxies all images found in HTML emails from to protect end customer's IP address and connection private.
Shortwave Communications Inc.Shortwave Image Fetcher
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What is Shortwave Image Fetcher?

Shortwave Image Fetcher retrieves remote images referenced in HTML email and serves them through Shortwave's image proxy. The origin sees a request from Shortwave rather than a direct image request from the email recipient's device.

That proxy arrangement protects the recipient's IP address and connection details from the image host. Shortwave also describes image proxying and tracking-pixel blocking as privacy features. For senders and CDN operators, a fetch from this user agent should be classified as email-image infrastructure, not an ordinary browser pageview.

The bot requests image resources; it is not documented as reading page metadata or following links to build a web index. Shortwave offers AI features in its email product, but no source ties this image fetcher to AI search, citations, or model training. Blocking it affects remote image delivery in Shortwave, not a site's AI visibility.

The complete recorded user agent is simply Shortwave Image Fetcher. Robots.txt behavior is unknown in the bot metadata, and Cloudflare's bot directory marks the identity as not following robots.txt. There is no verified IP or signature information in this entry.

Indirectly relevant

Is Shortwave Image Fetcher relevant for AI search?

Indirectly. Shortwave Image Fetcher has no AI product of its own, but its output can end up in the systems that AI answers draw on.

Shortwave Image Fetcher fetches pages to build link-preview cards. It does not feed an AI index, but it reads the same Open Graph and structured metadata that AI systems parse to understand your pages, so clean preview metadata doubles as AI-friendly metadata.

How to handle Shortwave Image Fetcher

Allow the fetcher on public email images if Shortwave recipients should see them. Use signed URLs or authenticated delivery when an image is private, because a user-agent check does not protect the resource.

The stable token can express a robots preference:

User-agent: Shortwave Image Fetcher
Disallow: /

Compliance is not confirmed, and Cloudflare says this identity does not follow robots.txt. Block the header or image path at the CDN or application when denial is required. Remember that any client can copy the user-agent string.

Examples

  • A newsletter contains a hosted banner, and Shortwave Image Fetcher retrieves that image through Shortwave's proxy for display in the email client.
  • An image host logs the Shortwave user agent and avoids treating its source address as the recipient's network location.
  • A private invoice image still requires a signed URL, so copying `Shortwave Image Fetcher` does not grant access to it.

Frequently asked questions about Shortwave Image Fetcher

Learn about AI visibility monitoring and how Promptwatch helps your brand succeed in AI search.

It retrieves images referenced in HTML emails so Shortwave can deliver them through its image proxy.

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