"Should I send this as a text or an email?"
It's a question that comes up constantly. Both channels work, but they work differently. Choosing wrong doesn't mean failure—it means leaving results on the table.
Here's how to think about it.
The Core Difference
Email is for depth. SMS is for urgency.
Email lets you explain, elaborate, and include rich content. People expect emails to be comprehensive.
SMS demands brevity. 160 characters. One link. One call-to-action. People expect texts to be quick.
This fundamental difference should drive every channel decision.
When SMS Wins
Time-sensitive offers. Flash sales, limited inventory, expiring discounts. If it matters that someone sees your message right now, text them.
SMS has a 98% open rate, and most texts are read within 3 minutes. Email open rates hover around 20%, often hours or days after sending.
Appointment reminders. The day before, the morning of. A text gets seen. An email gets buried.
Businesses using SMS reminders see 30-40% reduction in no-shows compared to email-only reminders.
Order updates. "Your order shipped" belongs in a text. People want immediate notification, not something they'll find later in their inbox.
Emergency communications. Service outages, urgent schedule changes, security alerts. When timing matters, text.
Simple asks. Quick feedback requests, yes/no questions, brief surveys. If it can be answered with a tap, SMS works better.
When Email Wins
Detailed information. Product launches, feature explanations, how-to guides. When you need more than a sentence or two, email is your channel.
Visual content. Email supports images, videos, formatted text, and design. SMS is basically plain text with a link.
Long-term follow-ups. Welcome messages, educational content, newsletters. Email builds relationships over time without feeling intrusive.
Documentation. Receipts, contracts, detailed confirmations. Things people might need to reference later belong in email, which is searchable and archivable.
Complex calls-to-action. If someone needs to compare options, read reviews, or think before deciding, email gives them space to do that.
The "Both" Strategy
The smartest communicators don't choose—they layer.
Example: Abandoned cart recovery
Day 1: Email with cart contents, product images, and a reminder.
Day 2: SMS with urgency—"Your cart is about to expire. Here's 10% off to complete your order."
Day 4: Final email with social proof and last-chance messaging.
Email does the heavy lifting. SMS adds urgency at key moments.
Example: Event promotion
6 weeks out: Email announcement with full details.
2 weeks out: Email with speakers, agenda, and FAQs.
Day before: SMS reminder with calendar link.
Event day: SMS with parking info or login link.
Different messages, different channels, same goal.
The Numbers Worth Knowing
| Metric | SMS | |
|---|---|---|
| Open rate | ~98% | ~20% |
| Click rate | ~20% | ~2-3% |
| Response time | Minutes | Hours/days |
| Cost per message | Higher | Lower |
| Content length | Limited | Unlimited |
| Unsubscribe expectation | Low volume | Higher volume OK |
Common Mistakes
Sending long content via SMS. If your message needs multiple texts to deliver, it should be an email.
Using email for urgent updates. That time-sensitive offer loses impact when it's opened two days later.
Over-texting. Email subscribers expect frequent contact. SMS subscribers expect rare, valuable messages. One promotional text per week is plenty for most businesses.
Ignoring preference. Some customers prefer text. Others hate it. Let them choose when possible.
The Simple Rule
Ask yourself: "Does this need to be seen right now?"
Yes → SMS
No → Email
It's not always that simple, but it's a good starting point. When in doubt, email is safer. It's less intrusive, and you can include more context.
But when timing truly matters, nothing beats a text.