SMS vs email marketing: When to use each and when to use both

Choosing between SMS and email marketing gets easier when you stop comparing the channels in isolation. A newsletter and an appointment reminder have very different jobs, so do a product launch and a last-minute delivery update. The right channel depends on what the customer needs at that point in the journey.

In many cases, you don’t need to choose one channel for the whole campaign. Email can handle the detailed part of the conversation, then SMS can take over later when the message becomes shorter or more time-sensitive.

TL:DR: Use email when customers need detail, visual content or something they may want to revisit. SMS is better suited to short reminders, alerts and messages tied closely to a particular moment. For product launches, abandoned carts and other multi-step journeys, using both can make sense if each message has a separate purpose.

SMS vs email marketing: quick comparison

There isn’t one channel that wins every category: a better comparison starts with the message you’re trying to send.

The rest depends on context: what has already happened, what the recipient needs next and how quickly the information loses relevance.

5 SMS vs email marketing use cases

Looking at real campaign situations gives a better answer than comparing channel averages.

1. Product launches: use email and SMS at different stages

Best choice: Both

A product launch rarely starts on launch day.

Email works well in the build-up because there’s room to tell the story properly. You can introduce the product, show what it looks like, explain what’s different and give people a reason to care before it becomes available.

SMS is more useful when the message gets simpler and more urgent.

OLIPOP is a good example. The drinks brand has used SMS to give subscribers early access to limited-edition flavor launches.

Its founders have said they use text much more selectively than email, sending only around two SMS messages a month compared with two or three emails a week. For some product drops, people on the SMS list hear about the launch before everyone else. 

The split reflects how the channels are being used: email does more of the build-up, and SMS delivers the shorter launch-day message.

The channels work better together when they’re not trying to do the same job.

Example sequence

Day before launch: Email → product story, images, pricing and launch information

Launch day: SMS → product is live + direct link

That same logic can work for event registrations, seasonal collections and limited inventory.

2. Appointment reminders: SMS usually makes more sense

Best choice: SMS for the reminder, email for the full confirmation

Suppose someone books a dental appointment for next Tuesday.

The first confirmation can arrive by email. It might include the clinic address, cancellation information and anything the patient should prepare beforehand. The day-before reminder doesn’t need to repeat all of that.

A text can do the job in a few lines:

Green Dental: Reminder that your appointment is tomorrow at 2:30pm. Need to reschedule? Call 01234 567890. Reply STOP to opt out.

The value of that reminder is connected closely to when it arrives. If the patient discovers it in an email inbox two days after the appointment, the campaign has failed even if the copy was excellent.

This pattern appears across other service businesses too. Restaurants can remind guests about bookings and property agents can confirm viewing times. We cover the property example in more depth in our guide to real estate text message marketing.

Automation also fits naturally here. A booking can trigger the confirmation email immediately, then an SMS can be scheduled closer to the appointment.

For a deeper look at those workflows, see our guide to building marketing automations in Transpond.

3. Newsletters and educational content: keep them in email

Best choice: Email

SMS isn’t a good home for every piece of communication.

Say you send a monthly newsletter with company news, industry updates and a new guide. Someone might read the intro, click into one article, then come back later for the rest.

Email supports that behaviour naturally.

Trying to split the same newsletter into several texts would create a worse experience. But then, compressing everything into one SMS would remove much of what made the newsletter worth reading in the first place.

The same applies to onboarding content that needs explanation, detailed product education and longer thought-leadership campaigns.

SMS can still appear around that content in specific cases. An event publisher might send the full agenda by email and later use text for a change to tomorrow’s venue, but the newsletter itself still belongs in email.

If you’re building this kind of recurring campaign, see our step-by-step guide to creating an effective newsletter.

4. Abandoned carts: use both, but don’t send them together

Best choice: Both

An abandoned cart is one of the clearest cases where email and SMS can complement each other.

Imagine a customer adds a pair of shoes to their basket and leaves the site. An email can restore that context. The customer can see the product again, check the price and return directly to checkout.

If nothing happens, SMS can become a later follow-up for customers who’ve separately opted into text messaging.

The sequence could look like this:

Cart abandoned → Email with cart contents → Wait → No purchase → SMS reminder to eligible contacts

Sending the email at 3:00pm and the SMS at 3:05pm would offer little benefit; the customer has barely had time to respond to the first message.

A later text has a clearer reason to exist.

Customer behaviour should also change the sequence. Someone who completes the purchase after the email doesn’t need the SMS, but someone whose cart is still active might continue through the journey.

That’s where email and SMS marketing automation becomes much more interesting than scheduling two separate broadcasts.

5. Same-day changes and alerts: SMS has the advantage

Best choice: SMS

Some messages have a short life.

A restaurant changes tonight’s reservation time. A delivery expected tomorrow is now arriving this afternoon. An event moves to a different entrance shortly before doors open.

These updates don’t need an elaborate campaign.

The recipient needs to see one piece of information before a particular moment passes, which makes SMS a natural fit.

A short transactional message could say:

North Street Kitchen: Your booking tonight has moved from 7:00pm to 7:30pm. Call us on 01234 567890 if you need to change it.

Email can still keep a longer record of the booking or order, but there’s little benefit in forcing an urgent operational update into the same format.

With Transpond, you can use SMS for messages such as appointment reminders and order confirmations. SMS is currently available to UK customers.

How to combine SMS and email marketing

The easiest way to misuse both channels is to treat SMS as a second send button for email.

Let’s say you’re running a one-day promotion with 20% off selected products until midnight. Email gives you room to show what’s included, explain any exclusions and give customers enough information to decide if they want to buy. SMS works better later in the day, when the message can be much shorter and focused on the deadline.

Poor coordination

10:00am → Email: Sale ends tonight

10:05am → SMS: Sale ends tonight

The customer has received two notifications but almost no extra value from the second one.

A coordinated version has more separation between the messages:

10:00am email

Show the products, explain the discount and include the terms.

Later SMS

Send a shorter reminder to opted-in customers who still have a reason to act before the promotion ends.

The distinction becomes especially important once behaviour enters the journey. Someone who already converted after receiving the email can leave the sequence, and a subscriber who hasn’t acted may still receive the later reminder.

Before adding SMS to an email campaign, ask what changes for the recipient.

Does the second message arrive at a better moment? Does it contain new information? Is there a reason this audience needs another notification?

If none of those applies, another message probably won’t improve the journey.

Email and SMS marketing work better with shared customer data

Running the two channels from separate systems is possible, but coordination gets harder.

The SMS platform may not know that someone already purchased after receiving an email. Campaign history can sit in different places, while marketers have to do more work to build audiences and keep messaging aligned.

For example, a customer might receive an email about a promotion, make a purchase an hour later and still receive an SMS reminder that evening if the two systems aren’t sharing customer activity.

A connected setup gives both channels access to the same signals. Once someone converts, the journey can stop. If they move into another segment, later communication can change. An SMS reminder can also depend on an earlier email action instead of being scheduled independently.

SMS vs email marketing metrics

SMS and email campaigns shouldn’t always be judged using the same measurement.

One commonly repeated comparison says SMS has a 98% open rate and then places that number next to an email open-rate benchmark.

It looks convincing, but it isn’t a clean comparison.

Email platforms track opens through mechanisms such as tracking pixels, though Apple Mail Privacy Protection and other privacy features can distort the number.

Standard SMS reporting doesn’t provide an equivalent open signal in the same way. Treating the two percentages as if they measure the same behaviour can give marketers the wrong impression.

Campaign goals provide a better starting point.

Email open rates can still help diagnose performance when you understand their limitations. Our email open rate benchmarks for 2026 explain those limitations in more detail.

For SMS, look at the action the message was designed to produce instead of trying to manufacture an equivalent open-rate comparison.

How to choose between SMS and email

Most campaigns become easier to classify once you ask a few concrete questions.

Does the recipient need detailed information?

If yes, start with email. Product information, several links or content someone may need to revisit all fit there more naturally.

Would seeing the message tomorrow reduce its value?

If the answer is yes, SMS becomes more relevant. Appointment reminders and same-day changes fall into this category.

Has another message already provided the detail?

A customer who received the full launch email may only need a short update once the product becomes available.

Would sending both messages mostly create a duplicate notification?

If so, choose one or change the second message.

Email and SMS marketing automation in Transpond

Transpond lets UK customers send standalone SMS campaigns and add SMS actions to Automations alongside their existing email activity. SMS currently requires an add-on and is available in the UK.

Because the SMS action sits inside the Automation, the text can be connected to the stage the contact has reached. Transpond also lets users decide what happens if a contact reaches an SMS step without a valid mobile number: the contact can remain at that step or move to the next stage in the Automation. 

For a broader walkthrough, see our guide to building your first marketing automation in Transpond. You can also explore the Transpond SMS feature if you want to add text messaging to your existing campaigns.

SMS and email marketing DON’T need the same job

The choice between SMS and email becomes much simpler once you start with the customer situation.

A newsletter belongs naturally in email, yet tomorrow’s appointment reminder probably doesn’t. A product launch may need both at different stages, and an abandoned-cart journey can change channel depending on what the shopper does next.

It can be tempting to squeeze every campaign into both inboxes, but that usually leads to repetition, not better communication. Give each message a reason to be sent, then choose the channel that fits that moment.

Try Transpond free and build email and SMS into the same customer journey.