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Should you choose between email and SMS? This is a question that comes up often, but it is based on a false assumption: that these are two competing channels. In reality, they don’t serve the same purpose, and they deliver their best results when used together.
Two channels, two complementary roles
Email handles depth. It allows you to deliver long-form, rich content: newsletters, product sheets, guides, brand storytelling, visuals, and more. Its sending cost is low, and its average open rate ranges between 20% and 30%.
SMS handles urgency. Short, read within minutes, and with an open rate exceeding 95%, it excels in real-time communication: appointment reminders, confirmations, alerts, limited-time offers. It is often the trigger that turns intent into action after email has done the preparation.
Together, they cover the full customer journey: email builds the message, SMS turns it into a click.
What the duo changes in practice
The impact is not simply the sum of two channels, but the result of their coordination. Several studies show that:
- omnichannel campaigns involving SMS can generate up to a 47.7% increase in conversions
- marketers using three channels or more achieve a 494% higher order rate compared to those using only one channel
Who does what: defining clear roles
To orchestrate effectively, follow a simple rule: detail belongs in email, urgency belongs in SMS.
Email is the channel that nurtures the relationship over time.
SMS is the channel that triggers action at the right moment.
Three scenarios where the duo makes a real difference
1. The onboarding journey A new contact subscribes to your list or creates an account. Immediately, they receive a comprehensive welcome email: who you are, what you offer, and the benefits reserved for new users.
Two or three days later, a short SMS encourages the first action: a welcome code, a starter offer, or a reminder to activate the account.
The email builds the relationship; the SMS drives the first conversion.
2. Events or appointments An email invitation is sent a week in advance, including the agenda and registration link. A reminder SMS follows the day before, providing only essential information such as time and location—delivered at the right moment. A follow-up email the next day includes a summary or replay.
Each channel reinforces the previous one and improves attendance and engagement.
3. Flash sales A detailed email announcement is sent a week before the offer goes live, building interest and setting expectations. On the morning of the launch day, a short and direct SMS is sent to trigger immediate purchase while the offer is active.
The email sets the stage; the SMS pushes the final action.
The same logic applies to post-purchase journeys: a SMS confirms delivery and reassures the customer, an email extends the relationship with tips or cross-sell offers, and a well-targeted SMS can later encourage repurchase or request a review.
To go further, explore our automated SMS scenarios for customer loyalty.
Rules to make the duo work without overwhelming your audience
Poor coordination can exhaust customers instead of converting them. Here are five key principles:
- Coordinate, don’t duplicate. Sending the same message on both channels creates irritation. Each message must add something new.
- Use the right message on the right channel. Urgency belongs to SMS, detail belongs to email. Reversing them reduces effectiveness.
- Work from a single source of truth. Without synchronization, a customer who buys after receiving an email may still receive an SMS reminder. This creates a poor experience. A unified contact database is essential.
- Control marketing pressure. Combining email and SMS also means combining frequency. Monitor overall sending volume, not just per channel.
- Respect consent on both channels. Email opt-in does not equal SMS opt-in. Each channel has its own consent rules and opt-out requirements (STOP keywords, GDPR compliance). This is non-negotiable and essential for maintaining trust. Our article on consent collection explains the process in detail.
How to orchestrate this in practice
To ensure email triggers SMS at the right time, your tools must communicate. This is the key to success. There are three main approaches depending on your technical setup:
- SMS API to connect TextingHouse directly to your e-commerce platform or internal tools
- HubSpot integration to manage email and SMS within a single CRM using unified workflows
- Zapier to connect your email platform (Brevo, Mailchimp, etc.) with SMS sending tools without development work
In all cases, the goal is the same: a unified contact base and automated workflows so each message is sent at the right time, on the right channel.
The easiest way to start: pick one scenario and connect SMS to your existing email flow.
The easiest way to start: try our platform for free with 10 SMS credits included.