Email is the room where you can tell a story. SMS is the room where you'd better have a good reason for knocking.
Both channels sell. They just sell differently, and treating them as interchangeable is how brands end up with an SMS program that costs more goodwill than it earns. Email gives you space: images, detail, a narrative, room for someone to decide. SMS is intimate, immediate, and short, and people guard their text inbox far more fiercely than their email, so every message has to earn its place.
When to reach for SMS
Use SMS for things that are genuinely time-sensitive and high-value, the moments where a few minutes matter:
- A cart about to expire, or a low-stock item someone was eyeing.
- A flash sale or a short window offer.
- Shipping and order updates people actually want in real time.
- Early access for VIPs, back-in-stock alerts, launch drops.
The test for any text is simple: would the customer be glad you interrupted them for this? If the honest answer is no, it belongs in email.
When to use email
Use email for everything that needs room to breathe: the welcome story, product education, the campaign with images and detail, the seasonal push, the nurture that builds a relationship over time. Email is where you make the case. SMS is where you close the loop on something urgent.
Many of your best flows run on both. SMS carries the urgent nudge, email carries the substance. A cart flow, for example, might text the expiring reminder while email handles the trust-building and the objection you can't fit in 160 characters.
SMS isn't right for every brand
This is the part most "add SMS now" advice skips. If your margins are thin, or your audience simply doesn't want texts from you, an SMS program can burn more relationship than it builds. And texting carries real compliance weight: proper opt-in and consent aren't optional, and getting them wrong is a legal problem, not just a marketing one. So the honest recommendation is sometimes "not yet," or "not at all," and I'll tell you that rather than sell you a channel that annoys your best customers.
Email and SMS are two instruments in one system. See how they fit with your flows and campaigns in the complete email & SMS playbook, or have me build and run both as part of the email & SMS service.
Micah Jacobi
Marketing specialist focused on the systems that turn traffic into revenue, SEO, websites, email & SMS, and paid media. More about me →