Plain-Text vs HTML
Email MarketingAlso: Plain-Text Email vs HTML Email · Text Email vs Design Email
Quick definition
Plain-text email is a message with no design, images or formatting, resembling a personal note. HTML email uses code to add layout, colour, images and buttons. The choice affects how an email looks, how spam filters treat it, and how recipients respond.
How it varies across Australia
Plain-text sends tend to land in the inbox more reliably than heavily designed HTML sends, particularly for cold outreach and re-engagement flows. Australian senders using shared or newer domains see this gap widen, since spam filters weigh sender reputation heavily.
See email deliverability benchmarks across Australian industries →What it actually means
The plain-text versus HTML choice isn't really about aesthetics. It's about what the email is pretending to be.
Plain-text looks like a message from a colleague. No logo, no banner, no button bar. That makes it feel personal, which is exactly why sales outreach and re-engagement campaigns lean on it. It also tends to trigger fewer spam filters, because spam filters were built to catch exactly the kind of heavy formatting that legitimate marketing HTML often uses.
HTML email is a small website delivered to an inbox. It carries your brand's visual identity, supports multiple calls-to-action, and lets you track opens and click-through rate (CTR) with more precision than plain-text allows. For newsletters, promotions and anything where visual merchandising matters, HTML does work plain-text can't.
The mistake is picking one and using it everywhere. Segmentation should decide the format as much as it decides the message. A cold outbound email pretending to be a glossy campaign reads as insincere. A product launch sent as plain-text reads as an oversight, not a strategy.
A plain-text email that looks like it was typed by a human beats a beautiful template that looks like it was typed by a marketing department.
How it shows up
It shows up in inbox placement first. HTML-heavy sends from unfamiliar domains get routed to promotions tabs or spam more often than plain-text equivalents. It shows up in reply rates too. Sales and outreach emails formatted as plain-text consistently pull higher reply rates than the same message wrapped in a template. It also shows up in mobile rendering, where over-designed HTML breaks more often than restrained layouts, and in tracking data, since plain-text sends usually can't carry the pixel-based open tracking that HTML relies on.
The Australian context
Australian inboxes lean heavily on Gmail and Outlook, both of which apply aggressive tabbed filtering to HTML sends that look promotional. Businesses new to cold email or running low sending volume domains see this most acutely, since a thin sender reputation combined with heavy HTML formatting is the fastest way to land in spam. Plain-text is often the safer default while a domain builds reputation.
Where people get this wrong
Related terms
Common questions
Does plain-text email really get better deliverability than HTML?
Generally yes, particularly for cold outreach or newer sending domains. Spam filters were built to catch heavily formatted promotional content, so restrained plain-text sends tend to avoid those triggers and land in the inbox more consistently.
Can I track opens and clicks on plain-text email?
Click tracking works fine on plain-text links. Open tracking usually relies on an invisible tracking pixel, which plain-text doesn't support in the same way HTML does. Most senders accept that trade-off for outreach and sales emails.
Should newsletters be HTML or plain-text?
HTML, in most cases. Newsletters benefit from visual hierarchy, multiple calls-to-action, and brand presence that plain-text can't deliver. The exception is niche newsletters where the personal, unpolished feel is part of the appeal.
Do plain-text emails look unprofessional to customers?
Not if the copy and subject line are strong. Plain-text reads as personal, not cheap. The businesses that struggle are the ones sending plain-text with sloppy writing, assuming the format alone will carry the message.
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About New Rebellion
New Rebellion is a marketing intelligence consultancy. We build tools, score Australian businesses on how their marketing actually performs, and publish Debrief every day. This dictionary is part of how we work in the open.
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