Set a Sustainable Email and Text Cadence That Protects Revenue and Retention

A practical cadence rule comes from overlap control. Most fatigue happens when the same high intent shopper gets hit by email, then text, then another email around the same offer. The fix is a rolling seven day exposure cap across both channels. Once a customer receives a set number of promotional touches, only triggered messages continue, while scheduled campaigns pause until the cap resets. That keeps urgency from turning into repetition.

I have found the strongest test is to compare unsubscribes against revenue by engagement tier, not the full list. Highly active buyers can usually handle more frequency, while low engagement groups need longer spacing and cleaner creative. When unsubscribe growth in colder segments outpaces revenue lift, the cadence is too aggressive. Stable results usually come from treating frequency as a privilege earned by behavior.

A useful starting point is a 2:1 value-to-promo rule and a 7-day fatigue check. For every pure sales message, send two that help the customer shop better: back-in-stock alerts, category tips, how-to content, loyalty updates, or a reminder tied to past browsing. That mix tends to hold unsubscribe rates closer to 0.1,0.3% per email send for healthy lists, while still driving steady repeat purchases.

The test that's worked best is cohort-based frequency bands. Split engaged customers by recency and click history, then trial one group at 2 emails a week, another at 3, and another at 4, while capping SMS at 2,4 per month unless there's a true high-intent trigger like cart abandonment or a delivery issue. In one apparel account, moving the most engaged segment from 2 to 3 emails a week grew email revenue by about 18% over six weeks, but 4 a week pushed unsubscribes up by roughly 60% with only a small sales gain. The less engaged segment did better with 1,2 emails a week and one SMS around a promotion window.

I use two guardrails. If unsubscribe rate jumps above about double the 4-week average, or revenue per recipient drops for two sends in a row, frequency is too high for that segment. Once those two numbers are watched by segment, not across the whole list, the cadence gets much easier to set without guessing.

The best cadence comes from respecting homeowner stress, not chasing volume. Heating and cooling purchases often begin during discomfort, confusion, or urgency. I build promotions around stress curves rather than standard campaign calendars. Day one explains options clearly, day three answers installation questions. Day six introduces savings, financing, or efficiency tradeoffs without pressure. Then wait seven days unless browsing signals show renewed purchase intent. That breathing room lowers fatigue because the sequence matches emotional readiness.

A practical test is the regret window after each communication burst. Track unsubscribes and complaint rates forty eight hours after every touch. Compare those figures with assisted revenue from the same audience. If post send regret exceeds five percent of generated margin, reduce. This rule keeps communication disciplined and protects future deliverability during peak seasons.

For our DTC menswear brand we run a 3-bucket cadence built around purchase recency, not a blanket weekly newsletter. Bucket A (last 30 days post-purchase): 1 email + 0 SMS per week. Order context only, no promo. Bucket B (31 to 120 days): 2 emails + 1 SMS per week. Mix of editorial and 1 promo. Bucket C (121+ days, no opens in 60 days): 1 email per month, win-back only, full discount stack.

The trigger we measure is not unsubscribe, it is "opened-but-not-clicked for 5 consecutive sends". That signals fatigue before the unsubscribe button. We auto-drop those subscribers to half cadence and watch click rate recover. 38% of fatigue-bucket subscribers come back to active click behavior within 90 days. Unsubscribe rate on win-backs dropped from 4.1% to 1.3% after we instrumented this.

Revenue split that worked: editorial sends (no offer) drove 9% of total email revenue but kept open rates above 28% across the year. Pure promo sends drove 73% of revenue but pulled open rates down to 14% within 8 weeks if run alone. The editorial sends are not revenue producers, they are open-rate insurance.

SMS rule: never send an SMS without a 60-min cooldown after the last email. Stacking the two within an hour was our highest single-day unsubscribe contributor in 2025. The customer reads them as the same push, double the irritation, half the credit.

The cadence that broke us: 4 emails plus 3 SMS per week during BFCM 2024. Unsubscribe rate hit 6.8% for that month. Took 5 months to rebuild the deliverability score on Klaviyo. We capped at 3 + 2 for BFCM 2025 and revenue actually held within 4% of prior year.

When combining email and SMS promotions in retail, increasing message volume across every channel often accelerates subscriber fatigue without improving revenue. The most effective approach is shifting from redundant broadcasting to channel affinity mapping. This process involves identifying the communication channel each customer naturally responds to best.

One practical rule that consistently improves performance is avoiding duplicate promotional pushes across channels within the same buying cycle. Instead of sending the same offer through both SMS and email, communication is prioritized based on demonstrated engagement behavior. Customers who consistently convert through SMS receive time-sensitive alerts there. Meanwhile, email is reserved for transactional communication, product discovery, or lower-frequency promotional content.

This approach also creates a simple fatigue-management test. If engagement drops on one channel after frequency increases on another, the total communication load is too high. Monitoring unsubscribe spikes, click decay, and delayed interaction patterns across channels helps identify when cadence starts exceeding subscriber tolerance.

In practice, this segmentation-first strategy leads to more stable engagement and lower unsubscribe rates because communication feels intentional rather than repetitive. Revenue remains strong because each message is delivered through the channel where the customer is already most receptive.

The cadence rule that has held up across 9 years and roughly 30,000 active subscribers at PerfumeM is inverse-to-recency. The more recent the purchase, the more emails the customer wants. The further away the last interaction, the less the customer wants.

Concrete schedule we use.

New customers in the first 30 days post-purchase: 1 email per week for 4 weeks. The content is product education plus 2 curated picks based on their order, not promotions. Open rates on this window run 38 to 44 percent.

Established customers (purchased in the prior 90 days but not the last 30): 1 email every 14 to 21 days. Mix is roughly half product picks and half evergreen content like seasonal scent guides.

Dormant customers (90+ days since last interaction): 1 email per month maximum. Anything more and the unsubscribe rate spikes. The content is "what's new" only, no promotions, because dormant customers who unsubscribe over a promo do not come back.

SMS gets its own discipline. Shipping updates only, plus one truly special promotional drop per month. We learned this expensively. SMS sent at email-frequency drove a 4.2 percent unsubscribe rate per send. SMS held to once-a-month-promo plus transactional drove a 0.4 percent unsubscribe rate and a substantially higher click rate when we did send.

The test that helps you find your own rhythm. Watch unsubscribe rate per segment per send, not the overall list rate. The overall rate hides the segment that's churning. We set 0.3 percent unsubscribe per send as the alarm threshold for any segment. If a segment crosses 0.3 percent on three consecutive sends, we cut its frequency by 50 percent and retest after 60 days. That single threshold has saved us from cooking the list twice in the past 3 years.

The principle. Revenue per send is the wrong metric to optimize. Revenue per subscriber over 12 months is the right one. Cadence decisions that look like they cost you money in the current send usually save you money on the back half of the year through retained subscribers.

Ahmad Khan, founder of PerfumeM (perfumem.com)