How can I determine the optimal sending frequency for my audience?

Most senders pick a frequency and stick with it forever. Weekly because someone said weekly. Daily because a guru said daily. But the honest answer is that your audience will tell you the right number. You just have to run the test and listen.

Here's a practical way to find your optimal frequency.

Start with a baseline, not a benchmark. Industry averages are a starting point, not a destination. Pull your last 90 days of data and calculate your average open rate, click rate, and unsubscribe rate per send. That's your control number.

Run a split-frequency test. Take one segment of your list (ideally 20-30% of engaged subscribers) and increase or decrease frequency for four to six weeks. Four weeks is a minimum. Six is better. You're looking for a directional signal, not a one-week spike.

Watch these three signals together, not in isolation:

• Positive signals: Open rate, click rate, replies. Rising or holding steady means the frequency is working.
• Negative signals: Unsubscribe rate, spam complaint rate. A meaningful jump here is your audience voting with their feet.
• List fatigue: If opens start dropping over consecutive sends at the higher frequency, that's a sign you're hitting a wall.

A "meaningful" change is roughly a 10-15% swing in either direction held across at least three consecutive sends. A single bad week happens. A trend is the signal worth acting on.

Don't forget to segment. New subscribers often tolerate (and even expect) higher frequency during a welcome sequence. Long-term subscribers who've quieted down might prefer less. Running one blanket frequency across your whole list hides what's actually going on inside it. If your ESP supports frequency controls per segment, use them. Klaviyo, ActiveCampaign, and Customer.io all handle this well.

Ask directly. A preference center where subscribers pick their own cadence isn't just good for engagement. It's also a strong deliverability signal. Mailbox providers notice when subscribers interact with your emails rather than ignoring or deleting them.

Still one more thing worth knowing: frequency and sending cadence aren't exactly the same thing. Cadence includes the rhythm and spacing between sends, not just how many you send. Two senders can both send three emails a week and feel completely different to their list based on when those emails land.

If you want a second set of eyes on your engagement numbers before you run a test, our SOS hotline is free and there's no pitch attached. Come say hi.