When a marketing email is first sent, it has a clear and clean design, featuring the same colors, logo, and message that the company uses in every campaign sent to customers. A week later, another email is sent, and everything looks different: the fonts have changed, the logo has been moved to a different spot, and the overall look seems like a completely new design.
At first glance, such differences seem minor and even harmless. In reality, a lack of consistency in the design of marketing emails can hinder brand recognition, and a unified brand experience in emails is essential to the smooth operation of a reputable company. Building it doesn’t require a large budget or an entire team of designers.
Why Email Designs Become Inconsistent
Over time, small design inconsistencies add up and cause major problems. The main cause is often that one person creates the company’s newsletter in an email marketing service, while another writes and formats the promotional messages.
Most marketing departments consist of just a few people, and each has their own way of working. As a result, many designs are created on the fly, with too little reference to previous ones, so that even if they follow brand guidelines, they will inevitably contain small differences.
Another common mistake is treating each email as a separate project. This wastes a lot of time on setup, even though the email could have been based on the structure of previous ones.
A Repeatable Design Process
Consistency isn’t hard to achieve, as it only requires a simple set of templates used for periodic newsletters and other campaigns sent to current and potential customers.
A retailer, for example, might work with three email formats: offers, seasonal updates, and regular newsletters. The content differs from one format to another, but the basic structure remains the same, with a common header, body text, font sizes, white space, and footer.
An email template builder can help a company create reusable designs that maintain the same visual identity across all customer communications. With predefined layouts, fonts, and brand colors, employees can prepare campaigns more efficiently, and every email bears the company’s signature.
The goal of consistency is for every message—no matter how different in occasion or content—to be immediately recognizable as coming from the same company, without the emails becoming identical.
However, templates only solve half of the problem described above—the technical one. The other half has to do with organization, because a set of templates used by three people without common rules will, within a few months, end up existing in three different versions. The simplest practice is to designate a single person who is responsible for the templates, approves any changes, and keeps a brief record of versions, noting the date and reason for each change. The other team members work within the template, changing the content and images without altering the structure, colors, or position of the logo. Such a rule requires only an explicit decision about who has the right to change what—without any new tools—and where this rule is lacking, consistency depends on each individual’s memory.
What Brand Equity Theory Explains
The argument in favor of templates has a precise theoretical basis. Kevin Lane Keller, a marketing professor at Dartmouth, proposed in 1993, in the Journal of Marketing, a customer-based brand equity model, according to which a brand’s value lies in the consumer’s knowledge of it. This knowledge has two components: awareness, consisting of recognition and recall, and image, that is, the associations the brand evokes. Recognition, as defined by Keller, is the consumer’s ability to confirm prior exposure when the brand is presented as a cue, and this is precisely the mechanism at play in the email inbox, where the recipient decides within a few seconds whether the message comes from a company they know.
Viewed from this perspective, every email with a different logo, colors, and fonts requires the recipient to start the recognition process from scratch, and the cues that should have been reinforced through repetition are scattered. A consistent template ensures that successive exposures are stored in the same memory trace, so that the tenth message benefits from all nine that came before it.
The first recognition cue appears, in fact, before the design, because the recipient sees the sender’s name and the subject line before opening the message. A sender name that alternates between the company name, an employee’s name, and a campaign name undermines recognition even before the template has a chance to work. Consistency therefore begins with a consistent sender name and a return address that does not change from one campaign to the next, and only then extends to the logo and colors.
The model has limitations that should be noted. It is a conceptual framework, and its components are measured primarily through recognition and recall surveys, which capture what consumers say rather than what they do. Research on advertising repetition, summarized by Cornelia Pechmann and David Stewart in 1988, has shown that repeated exposure to the same message leads, after a certain point, to fatigue—that is, reduced attention and even irritation.
The Ehrenberg-Bass school, through Byron Sharp, has questioned the importance of unique brand associations, arguing that distinctive and easily noticeable elements carry more weight than differentiation. For email, the practical conclusion drawn from this debate is a moderate one: visual identity must remain consistent, while content, images, and offers should be varied precisely to avoid fatigue.
Simple Brand Guidelines
For consistent emails, a few simple design rules are sufficient—no need for a lengthy document with countless scenarios. The first concerns typography: fonts must be easy to read on screen, and the sizes of headings, body text, and secondary information must be established in advance. The number of fonts should be limited. Many decorative fonts look good in a single email, but some email clients do not load custom web fonts and replace them with fallback fonts, so two fonts are sufficient.
Here is a color palette for marketing emails, built on the brand’s existing colors, with a readable background, sufficient contrast, and clearly defined call-to-action buttons so the reader knows what to do.
Consistent image handling involves fixed image dimensions, a set position for the company logo, and sufficient spacing between elements. A consistent design, therefore, does not stifle the creativity of each individual email.
Emails must work on all devices
A well-designed email that looks great in a desktop email client may look completely different and become difficult to read in a mobile email client. The risk increases when the email has a complex layout with multiple columns, large images, and numerous buttons—some placed very close together—and what looks flawless on a wide screen may appear completely disorganized on a smartphone.
Before sending the campaign, the email should be opened on screens of various sizes and tested both in your email program and in the major email clients. Attention should be paid to text readability, images, white space between elements, and whether important information is visible without excessive scrolling.
Data on email clients shows where testing should be focused. According to Litmus, which analyzes over 1.5 billion opens, Apple apps (Apple Mail on iPhone, iPad, and Mac) accounted for approximately 76.6% of opens in September 2026, Gmail for 16.1%, and Outlook for desktop for 3.5%. Apple’s figure is inflated by the Mail Privacy Protection feature, which automatically records opens, so it indicates where testing should be focused rather than how many people actually read the message. Gmail, in turn, imposes a technical limit that is easy to ignore: an email whose HTML code exceeds 102 KB is truncated and displayed with the message “Message clipped,” and the rest—including the unsubscribe link—appears only after an additional click. A clean template, free of legacy code from previous emails, also helps avoid this limit.
Dark mode introduces a variable that few test for. Some email clients automatically invert or adjust colors when the user has enabled dark mode, so a white background turns black, and a dark-colored logo saved on a transparent background may disappear almost completely. The solution is a version of the logo that remains legible on both backgrounds, verified once when the template is built, and then reused in all campaigns.
Emails must also be accessible, which requires descriptive alt text for images, minimum font sizes, and sufficient contrast between background and content.
There is a verifiable threshold for contrast: the W3C’s WCAG guidelines require a ratio of at least 4.5:1 between the color of regular text and that of the background, and for large text, the threshold drops to 3:1, which allows more flexibility for colored headings. The threshold is set once, in the template, and from then on, every email built using that template complies with it without requiring a separate check.
Continuously revising designs without reinventing them
Just because design solutions have been found that work better for customers doesn’t mean they should remain unchanged forever. Companies need to periodically review their designs, both to identify recurring elements that improve readability and to discover where the current design is causing problems.
The weaknesses of an email can be identified by analyzing campaign performance data. When used in testing and in reviewing existing designs, this data enables the improvements needed for optimal readability and to reduce problems.
However, data must be chosen carefully. Litmus estimates that Mail Privacy Protection affects between 55 and 60% of all opens, so the open rate has become an unreliable metric for comparing designs. Click-through and conversion rates, measured on the same template with only one variable changed, provide a more solid foundation. A test that simultaneously changes the logo, colors, and offer cannot determine which of these factors made the difference.
A quarterly review cycle, applied to the template rather than to each individual email, maintains a balance between stability and improvement. At each review, two lists can be separated: elements that change only through an explicit decision—such as the logo, color palette, fonts, and sender’s name—and elements that can be freely tested, such as the order of sections, button wording, or the size of main images. Changes that pass the test are incorporated into the template and version history, while those that fail are discarded, ensuring that the visual identity evolves slowly and in a documented manner, rather than through the accidental changes that caused the problem in the first place.
Consistency Beyond the Email Inbox
The logic of recognition described by Keller doesn’t stop at email. A recipient who receives a message from a company they don’t know well often checks—before clicking—who is behind it, and this verification involves the company’s website, its public profiles, and its directory listings. If the name, logo, and description differ from one source to another, the recognition carefully built up in emails is lost the very moment the reader seeks confirmation. Consistency in visual identity must therefore extend to the company’s identifying information, and here the issue is as much one of verification as it is of design.
A listing in a curated directory, where the description is written or verified by an editor, provides the reader with independent confirmation that the company exists, operates in its stated field, and can be contacted. The limitations must be clearly stated: such a listing does not guarantee the quality of the products, is not a recommendation, and does not replace verification of the sender through technical email mechanisms, such as domain authentication. It adds a stable reference point, with the same data as in the email, within a network of sources that might otherwise diverge.
It is not necessary for a company to appear in hundreds of directories with identical data. The discussion about the accuracy of business listings shows that a small number of reliable, up-to-date sources matter more than the volume of citations. This rule aligns with that of the email template, since in both cases a limited set of elements, kept strictly consistent, generates more recognition than a widespread but haphazard presence.
For companies that don’t have in-house designers, the challenge shifts elsewhere, since the template must be created once—and done right—by someone who understands both visual identity and the technical constraints of email clients. The web design category in the Jasmine Directory includes branding studios and agencies, and the category description recommends comparing providers based on their portfolios, case studies, and their responses regarding accessibility. The same criteria apply to an email template provider, from whom it’s worth requesting examples tested in Gmail and Outlook, rather than simple screenshots from the editor.
Conclusion
Thus, the problem of emails that look different every time they’re sent turns out to be a matter of memory before it is one of aesthetics. Every consistent presentation adds to brand recognition, and every deviation forces the reader to start over. It can be concluded that a well-designed template, tested on real clients and measured using reliable data, functions as a form of institutional memory, preserving the company’s identity regardless of who is preparing the campaign that week. Template-building tools make this easier, but the decision to adhere to it remains with the team.
