The Channel War That Doesn't Need to Happen
Every year, someone publishes an article declaring that email is dead, or that SMS is too intrusive, or that social media has replaced both. Every year, the data tells a different story. Email marketing generates an average return of $36 for every $1 spent. SMS messages have a 98% open rate and a 45% response rate. Both channels are growing, not shrinking, and the businesses that are winning in 2025 aren't choosing between them — they're using them together in coordinated, automated sequences.
The key is understanding what each channel does best and building your automation strategy around those strengths.
What Email Does Best
Email is the channel for depth. When you need to communicate something complex — a detailed proposal, a case study, a product walkthrough, a newsletter with multiple pieces of content — email is the right tool. People read email at their desk, on their lunch break, when they have time and attention to give. Email is also the channel for nurturing: long-term sequences that build trust and authority over weeks and months.
Email's weakness is immediacy. The average email open rate across industries is 21.5%, and most emails are opened within 24 hours of delivery or not at all. For time-sensitive communications — appointment reminders, flash promotions, urgent follow-ups — email is too slow and too easy to miss.
What SMS Does Best
SMS is the channel for immediacy and action. When you need someone to do something right now — confirm an appointment, respond to a quote, click a link — SMS is the right tool. The 98% open rate isn't just impressive; it's almost universal. Nearly everyone reads every text they receive, usually within 3 minutes of delivery.
SMS's weakness is depth. A text message has a 160-character limit (or 300 for MMS), which means it's not the right channel for complex information. SMS works best for short, clear calls to action: "Your appointment is tomorrow at 2pm — reply YES to confirm or call us to reschedule." That's it. That's the whole message.
The Combined Sequence: How to Use Both Channels Together
The most effective lead nurturing sequences use email and SMS in a coordinated rhythm, with each channel doing what it does best. Here's an example sequence for a service business responding to a new inbound lead:
Minute 1: Automated SMS — "Hi [Name], thanks for reaching out to [Business]! We'd love to help. A team member will be in touch shortly. In the meantime, here's a quick overview of how we work: [link]"
Hour 1: Automated email — Full welcome email with your story, your process, client testimonials, and a clear CTA to book a discovery call.
Day 2: Automated SMS — "Hi [Name], did you get a chance to review the info we sent? Happy to answer any questions — just reply here or book a call: [calendar link]"
Day 3: Automated email — A case study relevant to their industry, showing a specific result you achieved for a similar client.
Day 5: Automated SMS — "Quick check-in, [Name]. We have a few spots open this week for new clients. Would love to connect — [calendar link]"
Day 7: Automated email — "Last chance" email with a specific offer or deadline to create urgency.
This 7-day sequence runs entirely on autopilot. The only human involvement is when the prospect books a call or responds to a message. Multi-channel sequences like this routinely outperform email-only follow-up on lead-to-call conversion.
Compliance: What You Need to Know Before You Send
Before you start sending automated SMS messages, there are two compliance frameworks you need to understand: TCPA (Telephone Consumer Protection Act) in the US and GDPR in Europe. The core requirement of both is simple: you need explicit consent from a contact before sending them marketing messages.
For SMS, this means your opt-in form needs to include clear language like: "By submitting this form, you agree to receive automated text messages from [Business Name] at the number provided. Message frequency varies. Reply STOP to unsubscribe." This language must be visible at the point of opt-in, not buried in a terms of service document.
For email, the CAN-SPAM Act in the US requires that every marketing email include a physical mailing address and a clear unsubscribe link. GDPR adds the requirement for explicit consent in the EU. GoHighLevel handles unsubscribe management automatically, but you need to make sure your opt-in process is compliant before you start sending.
Measuring What Matters
For email, the metrics that matter are open rate (industry average: 21.5%), click-through rate (industry average: 2.6%), and conversion rate (how many clicks result in a desired action). For SMS, focus on delivery rate (should be 95%+), response rate (industry average: 45%), and opt-out rate (anything above 2% means your messages are too frequent or not relevant enough).
The most important metric for any multi-channel sequence is the overall conversion rate: what percentage of contacts who enter the sequence end up booking a call, making a purchase, or taking whatever action you're driving toward. Track this number monthly and use it to continuously improve your sequences.
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