There is no universal answer to "how often should I send email", but there is a wrong answer for almost every business: more than you do now is probably too much. Here is the data on what frequency actually works, and the simple test to find your own line.
The unsubscribe curve
Across millions of campaigns, unsubscribe rate stays flat from 1 send per month up to about 3 to 4 sends per month, then starts climbing. Past 8 sends per month it accelerates sharply. The implication: most senders can roughly double their current cadence without harm; tripling it costs them subscribers.
2026 frequency benchmarks by industry
| Industry | Sweet spot (per week) | Limit before unsubs climb |
|---|---|---|
| Ecommerce promotions | 3-4 | 6 |
| Newsletters / media | 1-3 | 5 |
| SaaS lifecycle | 2-3 | 5 |
| Financial services | 1 | 2 |
| Real estate | 1-2 | 3 |
| B2B drip / nurture | 1-2 | 3 |
| Newsletters (premium) | 2-5 | 7 |
| Daily deals | 5-7 | 10 |
These are averages. Your audience might tolerate twice this, or half. The only way to know is to test.
The frequency test
Take a sample (say, 10% of your list) and increase send frequency by 50% for four weeks. Compare the sample to the control:
- If unsubscribe rate is unchanged or marginally up, you can sustain the higher frequency.
- If revenue per subscriber goes up by more than unsubscribe loss, send more.
- If unsubscribes spike or open rate drops sharply, you found the limit.
What over-sending actually costs you
Three things:
- Subscribers gone forever. Unsubscribe is permanent. The cost of acquiring them again is high.
- Sender reputation damage. Aggressive frequency often means lower per-email engagement, which mailbox providers see and downgrade you for.
- Spam complaints. Tired subscribers click "Report spam" instead of unsubscribe. Each one hurts more than an unsubscribe.
How to send more without over-sending
- Segment by engagement. Send daily to your top 10% engaged. Send weekly to the middle 80%. Send monthly or sunset the bottom 10%.
- Personalize content, not just frequency. Same frequency feels different to different people based on relevance.
- Let subscribers choose. "Daily, weekly, monthly?" preference center. Engagement and retention both improve.
- Test by audience segment. Active customers tolerate more frequency than passive ones.
FAQ
What is the absolute maximum I can send to a single subscriber?
The legal answer is "as much as they consented to". The practical answer for most lists is 5 to 7 per week before fatigue spikes.
Does sending less ever hurt deliverability?
Yes. Sending so rarely that mailbox providers forget who you are can lead to your domain being treated as untrusted on the next send. Once per month is the soft floor for most B2B senders.
What about transactional emails?
Receipts, password resets, order confirmations are not part of the frequency calculation. Subscribers expect those and do not unsubscribe over them.
Send to the right addresses
Sending more often only helps if you are sending to valid addresses. Verify your list quarterly to keep frequency optimization meaningful.