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Graph/email-embedded-image-404

Pattern

Email Image Source 404

email-embedded-image-404

A recurring email-delivery problem where embedded image URLs resolve to a 404 page, leading to broken visuals in inboxes; the shared shape is invalid/unreachable image hosting that causes the rendered image to fail.

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Updated4/30/2026

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30 linked nodes

Images in this message are hidden. This message might be suspicious or spam. — When Gmail users receive the transactional emails. Tension: Only Gmail exhibits this behaviour. Outcome: my logo appeared directly.

the image is not loading — whenever the email is delivered to an inbox. Tension: the `src` of the image goes to a `404` page. Outcome: To serve the images better you should look at a service like Vercel blob.

POST http://localhost:3000/api/send 500 (Internal Server Error) — when I try to send the email. Tension: using the email in the example “onboarding@resend.dev”. Outcome: Try changing the “from” part to a domain you own and verified via the domains settings.

It only works for 1 email, for any other email I use, the message is not being delivered — resend.emails.send({...,to:["an_email"],...}). Outcome: the free version has Audiences Limit, of 1 per day.

when I open it, it doesn't open — I was able to send the attachment. Tension: I am Bas64 encoding the file and then sending it within the field content. Outcome: So make sure that the string of the file that you're sending doesn't contain this value: `data:@file/png;base64,`.

the emails only reach the primary recipient, and not the copies — I'm using the free version of RESEND. Tension: they don't appear to have been sent to the CC and BCC fields, even though I've included them. Outcome: Add your domain, complete the domain verification and use your verified domain as from address.

it doesn't appear, everything disappears and leaves a blank page — when I add an image by clicking on the button in the fixed toolbar.

not let me type into any of the inputs — developing a simple form to send messages to my email with the help of `EmailJS`. Outcome: The issue you're experiencing is likely due to the way you're handling the `id` attribute in your `` and `` components and not correctly associating the `name` attribute with your form's state.

Environment URL '' is not a valid http(s) URL. Tension: it will not be shown as a link in the workflow graph. Outcome: got this error.

Uploaded images using Multer are not appearing on the Vercel-deployed Express server and cannot be referenced by a stable 'path/to/image' under a local uploads directory.

one of my requests to retrieve a photo fails with a 400: BAD_REQUEST error. Code: INVALID_IMAGE_OPTIMIZE_REQUEST — When I execute from my production server. Tension: In staging, the request successfully retrieves this image on the production S3, and production is able to retrieve an image from the staging S3. Outcome: The way I optimized the images was by using an absolute path.

After having never received this error in Sentry, all of a sudden we have received 20 of these errors over the last day on our app. — Large Render Blocking Asset / New Issue /static/js/main.779fa2a0.js. Tension: Our website https://cbbanalytics.com/ doesn't have the fastest loading home-page, but we haven't changed anything major in the last day that would lead to this issue. Outcome: perhaps this issue was recently added to Sentry, which is why we weren't receiving this issue earlier...

This particular set of mysterious errors has been asked about on Sentry's GitHub — they reference a WebKit issue. Tension: they are caused by an error coming from a Safari browser extension. Outcome: can safely be ignored, or filtered.

there's no `index.html` here hence the 404 Page not found error — the GitHub Pages deployment is from `docs/html`. Outcome: Changing `OUTPUT_DIRECTORY` to `./docs` on line 9 and removing/commenting line 38 should resolve this issue.

docker-entrypoint.sh: exec format error — build the image in GitHub Actions and post it in Github Package Registry. Outcome: You have a broken image.

Could not find a part of the path C:\\home\\site\\wwwroot\\EmailTemplates\\OtpValidation.htm — an endpoint that sends an email using a .htm template. Tension: this template cannot be resolved in deployed API. Outcome: this endpoint throws an error.

Rounding an image’s corners worked only when the container was square (1:1); non-square images were not clipped correctly after being resized to a max size of 512x512 while preserving aspect ratio.

no access logs are being generated in email-open-logging — enabled server access logging on the email-tracking-pixel-ssp bucket. Tension: the image loads correctly when the email is opened, but no access logs are being generated.

Texts written in this way of course stop displaying images after this time — After adding an embedded/inline image in Trix, a temporary url is saved in the body content.

I want to use a background image on my simple webpage. It's currently uploaded to S3 and distributed via Cloudfront. Tension: it displays as one would expect. Outcome: You may want to consider configuring your S3 bucket's CORS configuration to allow specific websites served from other domains to pull your image and display it.

When a Symfony email verification (signed) link has expired, users cannot request a new verification email and see only the expired-link message.

One SVG import renders as a broken image icon while an identical-looking SVG file renders correctly in a React site. Git shows the two SVGs differ even though no content was intentionally changed.

An SVG with a non-rectangular/irregular shape is not fully clickable in React, so clicks in transparent areas don’t register.

A React app tries to display a Google Drive-hosted image using a direct `uc?export=view&id=...` URL returned by a Django REST backend, but the image does not load in the app (even though the link works when pasted into the browser).

images have a weird jump behaviour — when the animation duration is completed. Tension: it works without issues but not for the images. Outcome: I wrapped the images inside a div and it worked.

The base64-encoded PNG strings returned from a Google Apps Script backend are not parsed correctly on the React frontend when rendering charts.

Images placed in the React app’s client/public/images directory are not being served/accessible from the Node.js backend, so they can’t be referenced from a Mustache-rendered page.

File uploads submitted from Safari to a Tomcat server become corrupted when HTTP/2 is enabled; uploads succeed in Chrome and when HTTP/2 is disabled. The issue affects multiple medium-sized files (a few MB).

Static image files served correctly when DEBUG=False, but return 404 errors when DEBUG=True.

Heap buffer overflow in GRUB2's PNG image loader — when processing crafted 16-bit grayscale PNG images without alpha. Tension: grub_png_convert_image() advances destination pointer by 4 bytes per pixel for 16-bit gray images, but the destination bitmap is allocated as RGB_888 (3 bytes/pixel). Outcome: causing heap OOB write of width*height bytes past the bitmap buffer.

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