Channel guide
Email vs. SMS for Customer Follow-Up
The best channel is not the one with the highest open rate. It is the channel that fits the customer's request, the information you need to communicate, and the consent your business can document.
Key takeaway
Use email for detail and durable context; use approved, consent-based SMS for short, timely conversations. Let the customer's preference guide you.
Choose email when
- The message needs a subject, explanation, links, or an attachment.
- The customer expects a less immediate response.
- You need room to summarize an estimate, proposal, or next-step options.
- You do not have documented permission for SMS.
Choose SMS when
- The customer provided appropriate consent.
- Your business messaging registration is approved.
- The message is short, useful, and related to the requested service.
- A quick reply would genuinely help move the conversation forward.
Use both carefully
A sequence may combine channels, but more contact is not automatically better. Avoid sending the same message by email and SMS at the same moment unless the customer expects both. Stop later steps after a response or opt-out.
Frequently asked questions
Is SMS always more effective than email?
No. SMS may be noticed quickly, but consent, context, detail, customer preference, and compliance matter more than a generic engagement statistic.
Can I text a phone number from a purchased lead list?
Do not assume a phone number is consent. Use SMS only when your business has the appropriate permission and can meet applicable legal and carrier requirements.
What should happen after someone replies STOP?
Your system should record the opt-out and prevent additional non-permitted messages. Do not work around the request by switching numbers or sequences.