What are recommended sending frequency caps?

Somewhere between "every day" and "once a quarter" is the answer most senders are looking for. The honest truth is there's no universal number that works for everyone. But there are some practical guardrails worth knowing.

For marketing emails, a common starting point is one to three times per week for active programs, once a week for moderate relationships, and once or twice a month for lighter-touch audiences. Daily sends are possible if your content is genuinely time-sensitive and your list engagement is strong. But "daily" only works when subscribers signed up knowing that's what they'd get.

Transactional emails don't really have caps. Password resets, order confirmations, shipping notifications. These go when the subscriber triggers them, and inbox providers treat them differently as a result.

The part most senders overlook is the per-subscriber view. If you run three lists and someone subscribed to all three, they might be getting three emails on the same day from the same domain. That looks like a flood from their inbox's perspective, even if each individual list is "following the rules." Coordinate across your sending programs so no one subscriber gets buried.

Here's what your own data will tell you faster than any industry benchmark. Watch for these signals that your frequency is too high:

• Unsubscribe rate climbing above 0.2% per send
• Spam complaint rate above 0.08% (the threshold Gmail flags as a warning)
• Open rates dropping steadily over three to four consecutive sends
• Click-to-open ratio shrinking even when opens hold steady

And signs you might actually be able to send more:

• Consistent open rates above 25%
• Replies and clicks staying stable as volume increases
• Low unsubscribe rates even on denser weeks

Frequency caps aren't a set-it-and-forget-it decision either. What works in January for a retail list won't work in November when everyone is in promotion mode and inboxes are stuffed. Revisit your cadence at least quarterly, and after any major campaign push.

One underused option is letting subscribers pick their own frequency. It sounds like extra work but it dramatically reduces unsubscribes and keeps your most engaged people happy. If you haven't tried it, it's worth considering.

Not sure if your current cadence is hurting you? Our SOS hotline is free and we're happy to take a look at what you're dealing with.