Images & Assets in Export
Understand image hosting requirements: why emails require absolute HTTPS URLs and how to manage asset lifecycles.
Key Takeaways
- Email HTML cannot embed local file paths (e.g. src="/logo.png" or file:///C:/image.jpg). All images must use absolute public HTTPS URLs.
- Images uploaded to PostBrix are hosted on high-speed global CDNs with permanent URLs.
- Ensure hosted images remain accessible for the entire lifespan of your campaign.
- Avoid hosting images on staging or password-protected servers.
Why Absolute HTTPS URLs are Mandatory#
When a customer opens your email in Gmail or Apple Mail, their email client fetches images across the public internet.
- Broken:
<img src="/images/logo.png" />(The recipient's phone has no access to your local disk or web server root). - Correct:
<img src="https://assets.postbrix.com/workspaces/ws_123/logo.png" />.
Images uploaded to the PostBrix Asset Manager are automatically given permanent, SSL-encrypted public URLs backed by global Content Delivery Networks (CDNs) for rapid worldwide loading.
Asset Lifecycle Management#
Remember that recipients may open an email weeks or months after it was sent (for example, referring back to a receipt or boarding pass):
- Never delete images from your asset library while campaigns remain active in subscriber inboxes.
- Never host email images on temporary staging URLs or localhost tunnels.
- Use vector SVGs converted to high-DPI PNGs, as most email clients do not support inline SVG graphics.
Frequently Asked Questions
Does PostBrix charge for image hosting on the CDN?
Asset CDN hosting and caching are included in all PostBrix plans with generous bandwidth limits for standard marketing and transactional operations.
Can I host images on my own S3 bucket or CDN?
Yes. Simply paste the absolute HTTPS URL from your own CDN directly into the Image block Source URL field.