Reading channel and campaign signals: cadence, fatigue, and mix

The question this screen answers

"Am I sending the right amount, to the right people, on the right channel, and is it still working?"

Almost every brand gets cadence wrong in one of two directions. Either they under-send out of a nervous fear of annoying the list, and leave revenue on the table every single week, or they over-send, wring short-term revenue out of the list, and quietly burn down the very audience that makes email profitable. The channel and campaign screens exist to tell you which mistake you are making, before the damage shows up in your revenue.

Let me show you how I read them.

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Start with fatigue, and read it honestly

Fatigue is the single most important read here, because it is the early warning that you are over-mailing. SendLens works it out by comparing your last four weeks against the four weeks before, across five things that move when a list gets tired:

• Open rate, falling.
• Click rate, falling.
• Click-to-open rate, falling. This one is worth watching closely, because it strips out deliverability noise and tells you whether the people who do open still care.
• Unsubscribe rate, rising.
• Revenue per recipient, falling.

Those roll up into a single fatigue score. Do not read any one of them in isolation, read the pattern. A healthy list has the occasional soft week. A fatigued list shows several of these moving the wrong way at once: opens and clicks drifting down while unsubscribes drift up, and revenue per recipient quietly eroding underneath. That combination is the signature of a list being asked to do too much.

One caveat that matters, and SendLens is deliberately strict about it. Fatigue can only be measured if you have actually been sending. The comparison needs at least a few campaigns in each four-week window (the tool uses three as the floor). If you paused sending, or you have only just started, there is not enough data, and SendLens will tell you so rather than showing a reassuring "no fatigue." Read that gap as "we cannot tell yet," never as a clean bill of health. A quiet sender is not the same as a healthy one.

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What healthy looks like, and what a red flag looks like

Read these as directional patterns, not fixed thresholds, since every list and every category behaves differently.

A healthy sending pattern tends to look like:

• A low, stable fatigue score across a period where you are sending regularly.
• Open and click rates that wobble week to week but hold their level rather than trending steadily down.
• Unsubscribe rate that stays flat as you send. A list that can absorb your cadence without shedding people is a list you can lean on.

Red flags I look for straight away:

• Falling engagement and rising unsubscribes at the same time. This is the important one, and it needs the right interpretation. The instinctive read, that the list is dead and you may as well give up on it, is wrong. What is actually happening is that you are burning it: sending more often than your audience wants, so the engaged are disengaging and the marginal are leaving. The fix is cadence and relevance, and a bigger send only makes it worse.
• Revenue per recipient sliding while total revenue holds up. A classic trap. You are propping up the top-line number by mailing more often, but each send is worth less and you are drawing down the list to do it. That is borrowing from next quarter to pay for this week.
• A fatigue score that cannot be computed because you barely send. The opposite failure. This is the under-mailer leaving money on the table, and the honest read is that you are not sending enough to even measure, which no one should mistake for a clean bill of health.

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Read your channel mix and your revenue source separately

Cadence tells you how hard you are pushing. Two more reads tell you whether the effort is landing where you think it is.

Channel ROI (email versus SMS). SendLens splits weekly revenue by channel alongside how much you sent and how big each list is. Read it as revenue per send, not revenue in total. A channel with a smaller audience that produces more revenue per message is telling you where your next hour of effort should go. SMS in particular tends to be under-used and high-returning for the brands that have it, and easy to over-use and expensive for the brands that lean on it too hard. The per-send figure keeps you honest either way.

New versus returning revenue. This is the read that stops you fooling yourself. SendLens splits your order revenue into first-time buyers and returning customers. A big campaign week can look like a triumph, but if almost all of that revenue is returning customers who would have bought anyway, you have not grown, you have pulled forward demand and possibly cannibalised your flows. Healthy programmes show both: genuine first-time revenue coming in, and a returning share that grows steadily as your base matures. If returning revenue is the entire story, your acquisition has stalled. If there is almost no returning revenue, your retention has, and that sends you straight back to the guides on who is slipping away and the repeat-purchase gap.

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Read send time and subject lines as tests you have already run

You do not need to guess at the best time to send or the best kind of subject line. You have already run the experiment, thousands of times, and SendLens reads the results back to you.

The best-send-time view surfaces the day and hour slots that consistently perform, and it only calls a slot "best" or "worst" once it has enough campaigns behind it to mean something. Read it that way: treat a slot with plenty of data as a reliable finding, and ignore a flattering slot that rests on one or two lucky sends. The same discipline applies to subject-line analysis. Look for the patterns that repeat across many campaigns, not the single big winner, because the repeatable pattern is the one you can actually build a calendar around.

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Turning the read into a plan

Here is how I would act on what these screens tell you, in order:

1. If fatigue is rising, cut cadence before you do anything else. Pull back frequency, tighten your targeting so fewer disengaged people receive each send, and let the engagement metrics recover. You will very often find revenue holds or improves on fewer, better-aimed sends.
2. If fatigue cannot even be measured because you rarely send, do the opposite. Build a consistent calendar and increase cadence deliberately, watching the fatigue read as your safety gauge so you can find the ceiling without crashing through it.
3. Rebalance the channel mix toward the higher per-send return, within reason. Shift effort, not just volume, and keep watching SMS fatigue if you lean into it.
4. Interrogate a big revenue week with the new-versus-returning split before you celebrate it. Make sure you grew, rather than simply harvesting customers who were going to buy anyway.
5. Build your calendar on the send-time and subject-line patterns that repeat, and stop relitigating settled questions every week.

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What to check next time you open these screens

You changed your cadence or your mix. Come back in a few weeks and read again:

• Did the fatigue score fall after you pulled back, and did engagement recover? Fewer, better sends were the right call.
• Is revenue per recipient rising rather than being propped up by volume? You are drawing on the list less and getting more from it.
• Did unsubscribes settle while you kept sending? The list can sustain your cadence.
• Is the new-versus-returning split moving the way your strategy intends, with real first-time revenue if you are chasing growth, and a healthy returning share if you are banking on retention?

Get this loop right and you can turn cadence deliberately, like a dial, using the fatigue read as the gauge that tells you when to ease off and when you have room to push.