Email Frequency: The Numbers Most Charities Get Wrong

The argument about email frequency in charities usually sounds like this: "We are emailing too much" versus "We need to hit income targets". Both sides are usually looking at partial evidence. Frequency is not good or bad in isolation. It is a multiplier. Relevant messages at the right cadence can lift income and retention. Irrelevant messages at the same cadence can damage trust and deliverability fast.

Stop asking for one magic number

There is no universal "right" monthly send volume. Different supporter segments have different tolerance and different information needs. The practical model is frequency by segment, with hard caps and review rules.

1. Highly engaged active donors: higher cadence, richer stewardship and appeals.
2. Moderately engaged supporters: steady cadence with clear topic relevance.
3. Low-engagement supporters: reduced cadence and re-engagement pathways.
4. Dormant contacts: minimal sends, then suppression if no response.

The three numbers that matter most

Track these three before making cadence decisions:

• Unsubscribe rate by segment and campaign type.
• Complaint rate by segment and campaign type.
• Net revenue per 1,000 recipients by segment over rolling 90 days.

Open and click still help, but these three are stronger signals for balancing income and fatigue.

Build a frequency framework with caps

A practical framework sets expected cadence and maximum caps by segment, then enforces those caps across all campaign calendars. Without caps, urgent sends stack and fatigue spikes.

Example baseline framework

• High engagement: 1-2 sends per week cap, with at least one non-ask value email each fortnight.
• Mid engagement: 2-4 sends per month cap, focused on relevant topics and clear asks.
• Low engagement: 1-2 sends per month cap plus periodic re-engagement message.
• Dormant: quarterly reactivation attempt, then suppress if no action.

Editorial quality and cadence are linked

Frequency fails when content quality and targeting do not keep up. Teams often add sends faster than they improve relevance. Build editorial planning at the same time as cadence planning: who this email is for, what action is expected, and what value the supporter gets if they do nothing today.

Testing model that avoids false conclusions

Frequency testing should compare segment-level outcomes over at least two campaign cycles. One-off tests during exceptional periods can produce misleading conclusions.

1. Select one segment and test two cadence levels.
2. Keep creative quality comparable across variants.
3. Measure net revenue, unsubscribes, complaints, and retention impact.
4. Roll out only when uplift persists across cycles.

The strongest email programmes do not send less or more by default. They send as often as each segment can still say, "this was worth opening".

90-day reset plan for teams under pressure

1. Month 1: segment file by engagement and giving recency.
2. Month 2: apply caps and remove low-value recurring sends.
3. Month 3: test one controlled frequency increase in the most responsive segment.

Frequency discipline protects both supporter trust and fundraising stability. For most charities, the gains come less from sending fewer emails and more from sending the right emails to the right segments at a cadence they can sustain.

Related reading: Email Personalisation Beyond The First Name: Charity Playbook, Corporate Matched Giving: The Missing Double Most Charities Forget and Ramadan Appeals Without Tokenism: A Charity Guide.