Email Marketing vs SMS Marketing
Two direct channels, very different economics — when does each win?
Email and SMS are the two direct channels you actually own — no algorithm sits between you and your customer. But they perform very differently. Email handles long-form education, nurturing, and transactional communication at near-zero marginal cost. SMS delivers short, high-urgency messages with open rates above 95%. Most Australian businesses under-use both. The smart ones run email as their retention backbone and layer SMS for moments that need immediate attention.
Side-by-Side Comparison
| Factor | Email Marketing | SMS Marketing |
|---|---|---|
| Open rate | 20–30% | 95%+ |
| Click rate | 2–5% | 10–20% |
| Cost per message | Fractions of a cent | AUD $0.05–$0.15 |
| Content depth | Long-form — articles, images, layouts | Short — 160 chars standard |
| Time to inbox | Minutes to hours | Seconds |
| Frequency tolerance | Higher — 2–4x/week common | Very low — 2–4x/month max |
| Compliance burden | Spam Act + permission-based | Spam Act + stricter scrutiny |
| Best-suited content | Newsletters, education, promos | Urgent, transactional, time-sensitive |
The Verdict
Email is your retention backbone — the default channel for everything from welcome sequences to monthly newsletters to win-back campaigns. SMS is the precision tool you deploy only when a message genuinely warrants interrupting someone on their phone: abandoned cart with a 2-hour window, appointment tomorrow, flash sale ending tonight, VIP-only drop. The biggest mistake businesses make is treating SMS like email and blasting weekly promotional texts — that burns the list within months. The second biggest is skipping SMS entirely for use cases where it would 5x conversion (cart recovery, appointment confirmations). The working model for most Australian businesses is email for breadth and depth; SMS for moments that actually matter.
When to Choose Each
Choose Email Marketing if
- You have a content strategy that benefits from nurturing subscribers
- Your customers have repeat purchase or subscription relationships with you
- You want low marginal cost per message
- Your messages need images, longer copy, or visual design
Choose SMS Marketing if
- You run e-commerce and want abandoned cart recovery
- You deliver appointments, reservations, or time-bound services
- You're running a flash sale, drop, or time-sensitive promotion
- You want to reach VIP customers for exclusive, time-critical updates
Use both if
- Email for weekly nurturing and promotions; SMS for appointment reminders and cart recovery
- Email for education sequences; SMS for the time-critical moment in the customer journey
- Email as the default; SMS only when the message genuinely warrants interruption
Frequently Asked Questions
Yes, but under stricter rules than email. The Spam Act 2003 requires explicit consent, clear identification of the sender, and a functional unsubscribe mechanism. "Implied consent" is narrower for SMS than email — existing customer relationships generally qualify, but cold SMS outreach to non-customers is much riskier.
Most businesses should cap at 2–4 messages per month, and each one should earn its place. Transactional and reminder messages (appointment confirmations, delivery updates, cart recovery) don't count against that cap since they're useful. Promotional frequency is where businesses burn lists.
Yes — email remains one of the highest ROI marketing channels when done well. The decline is in bulk broadcast emails with no segmentation. Segmented, behaviour-triggered, genuinely useful emails still generate strong returns. Businesses that treat email like a monthly newsletter sent to everyone are the ones seeing declining performance.
Email: Klaviyo, Mailchimp, and Campaign Monitor all work well. Klaviyo is the default for e-commerce. SMS: MessageMedia, Burst SMS, and Twilio are common Australia-based options. Many platforms (Klaviyo, Omnisend) now handle both email and SMS with unified automations.
Email promotional campaigns typically convert 1–3% of recipients. SMS campaigns convert 4–10% for warm lists and well-timed messages. Transactional messages (cart recovery, abandoned browse) convert much higher — 10–20% for email, 15–30% for SMS. Numbers vary heavily by list quality and offer.
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