The verdict in three sentences
There is no universal best channel: SMS wins on urgency, email on cost and retention, WhatsApp on conversation and conversion. The wrong instinct is to blast everything everywhere — you burn budget and exhaust your list. The right instinct is to pick the channel by objective and respect the consent required by law 2008-12.
Cost, open rate and conversion: the 2026 numbers
Each channel has a radically different economy. SMS is expensive but unbeatable on visibility; email is nearly free but fragile on deliverability; WhatsApp costs per conversation but offers a read rate close to SMS with interactivity.
| Criterion (2026 ballpark) | SMS | Email (Brevo) | WhatsApp Business |
|---|---|---|---|
| Cost per send/conversation | 10-25 FCFA | ~0.2-1 FCFA | 15-45 FCFA |
| Open / read rate | 90-95 % | 20-35 % | 80-90 % |
| Typical click rate | 8-15 % | 2-5 % | 15-30 % |
| Deliverability | High | Fragile (spam) | High |
| Opt-in required (data law) | Yes | Yes | Yes (strict) |
| Estimated average ROI | 1:8 | 1:30 | 1:12 |
Email crushes everyone on ROI because its marginal cost is negligible: sending to 10,000 contacts costs a few thousand FCFA. But its deliverability depends on your sender reputation — a poorly configured domain (SPF, DKIM, DMARC) lands in spam and the ROI collapses.
Which channel for which goal
The choice is made by marketing intent, not preference. A flash sale expiring in 6 hours is not run over email; a monthly newsletter is not run over SMS at 20 FCFA per unit.
| Goal | Recommended channel | Why |
|---|---|---|
| Flash sale (-50 % today) | SMS | Read in minutes, urgency |
| Order / appointment confirmation | SMS or WhatsApp | Reliability, receipt |
| Newsletter / content | Near-zero cost, rich format | |
| Abandoned cart recovery | Conversational, conversion | |
| Long-term retention | Email + WhatsApp | Controlled cost + closeness |
| Support / after-sales | Two-way, real time |
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Mini case study
Fatou runs a cosmetics shop in Dakar with 3,000 contacts. For her clearance sale she hesitates between SMS and email. By SMS at 15 FCFA: 3,000 × 15 = 45,000 FCFA, 95 % open, 10 % clicks i.e. 285 visitors, 4 % buy at 12,000 FCFA = 11 sales = 132,000 FCFA. By email: cost ~3,000 FCFA, 28 % open (840 readers), 4 % clicks (34 visitors), 4 % buy = 1 sale = 12,000 FCFA. For an urgent promo, SMS yields 132,000 FCFA for 45,000 invested (1:2.9 ROI on this push) while email barely mobilizes anyone in the window. Conversely, for her monthly content newsletter, email stays unbeatable over the year.
FAQ
Is SMS marketing legal without consent in Senegal? No. Law 2008-12 on personal data requires prior opt-in and an unsubscribe method. Mass-sending without consent exposes you to CDP sanctions and destroys your reputation.
Is free WhatsApp Business enough for mass marketing? Not beyond a small base: the free app caps broadcasts and risks bans. For volume you need the official WhatsApp Business API, billed per conversation (15-45 FCFA depending on category).
Why do my emails land in spam? Usually because of a domain without SPF/DKIM/DMARC authentication, sending from a free Gmail/Yahoo address, or a purchased list. A clean setup via Brevo or equivalent brings deliverability back above 95 %.
What monthly budget to start a multichannel mix? For an SME, plan 30,000 to 100,000 FCFA/month depending on list size: email nearly free, SMS reserved for urgencies, WhatsApp for conversion. Steering by objective avoids waste.
One tool or several? A unified tool (CRM + multichannel) avoids scattered lists and centralizes consent. It's simpler to comply with law 2008-12 and measure ROI per channel in one place.
Let's talk about your project. We wire your SMS, email and WhatsApp mix with compliant consent and per-channel ROI tracking. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
