What Is a Plain-Text Email?
A plain-text email is the simplest form of email message. It contains only character-based content: words, numbers, spaces, and line breaks. There is no HTML markup, no embedded images, no background colours, and no styled buttons. What you see is exactly what the server sends, and it looks the same whether read in Gmail on a desktop browser, Apple Mail on an iPhone, or a screen reader.
In modern email marketing, most campaigns are sent as multipart MIME messages, which bundle both an HTML version and a plain-text version in the same email. The subscriber's email client decides which version to display based on its settings and capabilities. Most clients show the HTML version by default, but the plain-text version is always there as a fallback. If the HTML fails to render, is blocked by a corporate firewall, or the subscriber has chosen to receive emails in plain text only, they will see the plain-text version instead.
Plain-text emails serve several important roles beyond fallback display. Spam filters analyse the text-to-image ratio in emails, and a message that consists almost entirely of images with minimal text is a common characteristic of spam. Including a well-written plain-text version improves your sender reputation by demonstrating that genuine readable content exists in the message. Certain corporate environments in South Africa, particularly in the financial and government sectors, block HTML emails entirely, making plain-text the only format that reaches these inboxes reliably.
There is also a deliberate marketing use case for plain-text emails. Sending a campaign that looks like a personal message from the CEO or account manager, with no header image and no visual template, can significantly increase open and reply rates for certain audience segments. The format signals authenticity and personal attention in a way that a polished HTML newsletter cannot replicate. Many B2B businesses in Johannesburg and Pretoria use plain-text formats for key relationship touchpoints such as renewal reminders, executive communications, and sales follow-ups.
Plain-Text Email In Practice
A Sandton-based B2B software company running a sales outreach sequence tested two versions of a follow-up email. The HTML version used their standard branded template with a header logo, a feature summary table, and an orange button. The plain-text version was formatted as a brief personal note from the account executive, with a single hyperlinked URL instead of a button. The plain-text version achieved a 41 percent open rate compared to 22 percent for the HTML version, and generated more than twice the reply rate.
For most marketing teams, the practical takeaway is twofold. First, always ensure your email platform generates an accurate plain-text companion for every HTML email you send. Do not allow the platform to auto-generate a garbled version full of code artifacts. Edit it to read naturally. Second, consider using intentional plain-text sends for high-value segments where personal tone is more persuasive than visual polish. The choice between plain text and HTML is not a quality question but a strategic one based on your audience and the relationship you want to signal.
When to use plain-text email
A plain-text email is an email containing only unformatted text, with no HTML formatting, images, colours or layout, just words. Despite the dominance of designed HTML emails in marketing, plain-text emails have genuine uses. They can feel more personal and direct, resembling an email a person would write to another person rather than a marketing broadcast, which suits one-to-one or relationship-focused communication, certain sales and outreach messages, and audiences or contexts where a personal tone works better than a designed template. They are universally readable, displaying reliably in any email client without rendering issues, and they load instantly and are lightweight. Some marketers use plain-text or very simple emails deliberately for this personal, unpolished feel, finding they can engage well precisely because they do not look like typical marketing. Plain text is also the fallback version included alongside HTML emails for clients or recipients that prefer it. So plain-text email is not merely a primitive alternative to HTML but a deliberate choice where a personal, direct, universally-rendering message serves better than a designed one, which is why it retains a place alongside HTML in email marketing.
Plain-text versus HTML email
Plain-text and HTML emails suit different purposes, and the choice depends on the goal and context. HTML email offers visual formatting, images, layout, branded design and clear call-to-action buttons, which supports engagement, conversion and brand presentation, making it the standard for most marketing campaigns, newsletters and promotional emails where visual communication matters. Plain-text email offers personal directness, universal reliable rendering and a non-marketing feel, suiting one-to-one communication, personal outreach and contexts where a human tone outperforms a designed template. On deliverability, the common belief that plain text always delivers better than HTML is oversimplified: well-built HTML emails from a reputable sender deliver fine, and deliverability depends far more on sender reputation, list quality and engagement than on format, though including a plain-text version alongside HTML supports deliverability. The practical approach is to match format to purpose: use HTML for visual, branded, conversion-focused campaigns, consider plain text or very simple emails for personal, relationship-focused messages where a human feel helps, and include a plain-text alternative with HTML emails. Rather than one being universally better, each format serves different communication needs, which is why both have a place in effective email marketing.
FAQ
Do plain-text emails have better deliverability than HTML emails?
Plain-text emails are less likely to be flagged by spam filters because they contain no image-heavy code or complex HTML that triggers spam heuristics. For cold outreach and transactional emails, plain text often achieves higher inbox placement. However, well-coded HTML emails from reputable senders with good list hygiene also achieve strong deliverability.
Should I include a plain-text version in every email campaign?
Yes. Every marketing email should include a plain-text alternative. Most email platforms generate this automatically from the HTML version. Some subscribers prefer plain text, and certain email clients or corporate spam filters display plain text by default. Including it also improves your sender reputation and reduces spam score.
Should you include a plain-text version in every campaign?
It is good practice to include a plain-text version alongside HTML emails, since it supports deliverability and serves recipients or clients that prefer or only display plain text. Most email tools generate it automatically, so including it is a low-effort way to improve reliability and reach across how recipients receive email.