Why Email Frequency Is the Wrong Thing to Optimise For

The question almost every brand asks about email is “how often should we send?” It is the wrong question. The right one is quieter and much harder: do we actually have something worth saying? Optimise for frequency and you will send more. Optimise for substance and you will be read.

Frequency is a proxy metric

Frequency tells you how often you are showing up. It tells you nothing about whether showing up is doing anything. A list emailed twice a week with relevant, valuable content will comfortably outperform one emailed daily with filler. Set frequency as the goal and the behaviour that follows is predictable: the calendar fills with sends, a few genuinely good, most adequate — and slowly the subscribers who were paying attention stop, because the signal-to-noise ratio has quietly collapsed. Every filler email teaches the list that your emails can be safely ignored.

The best email programmes are not the most frequent. They are the most anticipated.
— The Antimony position

What to optimise for instead

Relevance. Every email should pass one test before it goes out: is this something this specific subscriber will be glad they received? The test is demanding on purpose. It rules out the habitual send, the “we haven't emailed in a while” send, the send that exists to hit a number. What survives it is a programme made entirely of emails worth opening.

By the numbers

• Revenue per recipient — the metric that matters. Open and click rates can look healthy while the programme quietly underperforms; revenue per recipient asks the only commercial question.
• Cohort, not list — measure engagement by cohort; the aggregate hides the truth.
• Less than instinct suggests — the right frequency, found by testing, is almost always lower than the calendar-driven default.

How to find your right frequency

There is no universal answer, only a method. Start by sending less than you think you should. Measure by cohort. The frequency that produces the best revenue per recipient for your audience is, by definition, your right frequency. Send less, say more, and become the sender whose emails get opened first. Request the Brand Retention Audit to find out what your programme is really worth.

Key takeaways

• Frequency is easy to move and means nothing on its own — it is a proxy for the thing that matters.
• The relevance test: would this specific subscriber be glad to receive this email? If not, don't send it.
• Measure revenue per recipient by cohort, not opens across the whole list.
• Your right frequency is discovered by testing downward, not by filling a calendar.

Appendix & sources

Definitions. Revenue per recipient: campaign revenue divided by delivered recipients. Cohort: subscribers grouped by join date or source. Signal-to-noise ratio: the share of sends a subscriber finds valuable.

1. Method and observations: Antimony Studio lifecycle engagements, 2018–2026.
2. Related reading: Gmail Is Not Punishing DTC — why engagement now determines deliverability itself.