Why Image-Only Flyers Are a Deliverability Problem And What to Do About It

Image-only emails are the default in commercial real estate. Brokers love them design is clean, formatting is consistent across clients, and they take 10 minutes to produce. But if you're the person responsible for campaign performance, you're absorbing the deliverability hit from every one of those blasts.

What inbox providers actually see

When you send an email that's nothing but a PNG or JPEG, spam filters read it as a blank message. No readable text, no engagement signals, no context to determine legitimacy. Your text-to-image ratio is zero and that's one of the most heavily weighted scoring factors in modern spam detection.

This doesn't just hurt that campaign. Repeated sends with poor deliverability signals damage your sender reputation over time. Once you're landing in spam, getting back out is a project, not a quick fix.

Three other problems you inherit

Beyond deliverability:

Mobile rendering. Over 60% of commercial email is opened on mobile. A full-page listing flyer renders as a tiny, unreadable image on a phone. Your click rate suffers even if the email makes it to the inbox.

No searchability. When a broker's prospect wants to find "that industrial deal in South Dallas" from three months ago, they're searching their inbox by keyword. If the email is 100% image, that search returns nothing.

No meaningful click data. With an image-only email, you get a click or you don't. You can't tell which section of the flyer was compelling. You can't optimize what you can't measure.

The fix doesn't require killing the design

You don't need to redesign the flyer. You need to wrap it in proper email structure:

• Add 50+ words of readable text above or below the image. The property specs, a one-sentence hook, a clear CTA. Give the spam filter something to evaluate.


• Wrap the image in a link. Property page, offering memo, wherever you want the click to go.


• Compress the file. Under 500KB. Gmail clips emails over a certain size, which cuts off your CTA entirely.


• Use alt text. A large portion of corporate environments block images by default. Alt text keeps your message readable when images don't render.


• Make sure your platform generates a plain-text version. Every legitimate ESP supports this. If yours doesn't, that's a different problem.

The checklist before every send

Before any campaign goes out:

• Does the email contain at least 50 words of readable text outside the image?


• Is the image under 500KB?


• Is the image wrapped in a link?


• Does the plain-text version exist and make sense?


• Does it render correctly on mobile?


• Have you checked the subject line preview on both desktop and mobile?

None of this is complicated. But it's the kind of thing that gets skipped when ops doesn't have a pre-send checklist enforced in the workflow.

The real issue

Most CRE marketing teams don't have anyone whose job it is to enforce this. Brokers export a flyer and fire it off. Nobody checks deliverability signals until open rates start declining and by then, the damage is already accumulating.

Building a pre-send review step into your campaign workflow is the actual fix. The checklist is just the tool.

RevXCRE — Email Marketing & Marketing Ops for Commercial Real Estate