Should Ecommerce Emails Be Designed Mobile-First?

Yes, ecommerce emails should generally be designed mobile-first.

The reason is not simply that phones have smaller screens or that most people visit stores on their phone. It is that mobile has become one of the main places where customers browse, evaluate products, and buy.

Adobe found that 56.4% of U.S. online transactions during the 2025 holiday season happened on smartphones, up from 54.5% the year before. On Christmas Day, mobile’s share reached 66.5%.

If a large share of customers are interacting with the store and completing purchases on their phones, the email should be built around that environment first.

The desktop version still matters, but the priority should be the device where the customer is most likely to engage with the brand and move toward a purchase.

Mobile-first is different from making a desktop email responsive

A responsive email adjusts to different screen sizes, while a mobile-first email starts with the phone. This means you do not build a large desktop layout first and then ask how it should collapse onto a smaller screen.

You start by deciding:

• what the customer needs to understand immediately
• which message or product deserves the first screen
• what can be removed
• where the main CTA should appear
• how much scrolling is reasonable

That often produces a cleaner email because you are forced to make the important decisions earlier.

Prioritize what the customer needs to see first

Mobile gives you much less space before the customer has to scroll, and that makes hierarchy more important.

For a sale, the first screen may need to communicate:

• the offer
• the relevant product or category
• the deadline
• the CTA

For a product launch, it could be:

• the product
• why it matters
• the CTA

For cart abandonment, it could simply be:

• the product left behind
• the reminder
• the route back to checkout
• the offer (if any based on behavior)

The goal is not to squeeze everything above the fold; it’s to make sure the most important part of the message gets the most attention.

A desktop layout can sometimes hide weak prioritization because there is more room available, but a mobile screen does not give you that room. On mobile, poor hierarchy becomes obvious very quickly.

Make the email easy to read, browse, and act on with one hand

The basic mobile design rules still matter, and they start with:

• simple layouts
• readable type
• short paragraphs
• large, well-spaced buttons
• enough space between clickable elements
• images that load quickly
• clear CTA hierarchy
• subject lines that communicate the important message early

Adobe’s own email design guide puts numbers on this: keep to a single column where possible, use at least 16px for body text, and make buttons at least 44px high with generous padding.

The goal is to remove unnecessary effort between opening the email and taking the next action. A customer should not have to zoom, tap precisely, or scroll through several unnecessary sections before they understand what you want them to do.

Mobile-first should influence the content, not just the layout

This is where mobile-first design goes beyond making a template technically responsive; it should also influence what you decide to include.

Imagine a desktop product campaign that shows eight products.

On desktop, that may work perfectly well, but on mobile, stacking the same eight products one after another can create an extremely long email.

A better mobile-first decision might be to:

• lead with the strongest product
• show fewer recommendations
• shorten supporting copy
• move secondary information lower
• remove content that does not support the main action

That does not mean the mobile version needs to feel incomplete; it means the content has been prioritized around the way someone will actually experience it.

You also need to find a balance that works across both mobile and desktop.

Most brands are not going to send completely different versions of the same campaign based on device. The same email still needs to work for customers opening it on a laptop and customers opening it on a phone.

That means customer behavior should influence how much content you include in the first place.

You may need to limit the number of products you showcase, keep the offer easy to understand, and avoid adding more copy than the message actually needs. The goal is to create an email that feels complete on desktop without becoming overwhelming on mobile.

Mobile should set the tighter constraint, but the final email should still work naturally across both. This is therefore partly a content decision, not just a design or development decision.

Different campaigns can still look very different on mobile

Designing mobile-first does not mean every ecommerce email needs to become short, plain, or visually identical.

• A founder email might still be mostly text.
• A product launch may still depend heavily on photography.
• A recommendation email may still need several product cards.
• A sale may need strong merchandising.

The format should still depend on what the campaign is trying to accomplish, and the brand should determine how the email looks and feels. Mobile simply becomes the environment that those decisions need to work within.

A useful way to think about it is:

Campaign job determines the content → Brand determines the expression → Mobile determines the constraints.

A visual fashion brand does not need to stop being visual because customers are reading on phones. It may simply need larger product imagery, fewer competing elements, and a clearer path through the email.

The mobile experience continues after the click

For ecommerce brands, the email itself is only the beginning of the mobile experience.

The real journey is:

Email → product or category page → cart → checkout

This matters because smartphones are not only where customers read marketing messages.

In a research report done by Adobe Analytics, they found that smartphones accounted for the majority of U.S. online transactions during the 2025 holiday season.

So a beautifully designed mobile email is not enough if the customer taps through to:

• a slow product page
• difficult navigation
• a desktop-oriented landing page
• a confusing cart
• a frustrating checkout

Baymard’s 2021 mobile commerce research found that preventable usability issues caused 63% of test participants to abandon a product or site at least once.

This means email and destination should be treated as one journey.

If someone taps a specific product in the email, take them directly to that product. If the campaign is about a particular category, the landing page should make that category easy to browse.

The work you did to simplify the email should not be undone one tap later.

Test the actual mobile experience, not just the preview

Before sending, check the email on the devices and email clients your customers actually use.

Look for:

• subject-line truncation
• images loading slowly
• copy that is too small
• awkward spacing
• buttons that are difficult to tap
• dark-mode problems
• product cards that stack badly
• emails that become too long
• links that lead to poor mobile pages

Do not rely entirely on the ESP preview because a template can look correct in an editor and still feel awkward on an actual phone.

And when reviewing performance, look beyond opens.

Some important metrics are:

• clicks
• product views
• add-to-cart
• checkout
• purchases

Where possible, compare these by device.

If mobile generates most of the traffic but desktop customers convert at a much higher rate, that is useful information. The problem may not be the email at all; it may sit further down the mobile shopping journey.

A simple mobile-first email check

So, should ecommerce emails be designed mobile-first?

Yes.

Not because desktop no longer matters, but because ecommerce brands should prioritize the environment where customers increasingly browse and buy.

Mobile should influence more than whether the template technically fits a small screen.

It should influence what appears first, what gets removed, how products are presented, how much copy is used, where the CTA goes, and what happens after the customer taps.

Mobile-first email design means designing around where the customer actually interacts with the brand.

That is how the email becomes easier to use, easier to act on, and better connected to the rest of the shopping experience.

Nexie is a retention marketing agent for e-commerce brands. It reads your customer data across engagement, recency, category interest and lifetime value together, surfaces the audiences worth campaigning to, and builds those campaigns for your team to review and approve, inside the guardrails and marketing policies you set. See how it works →