Knowing your limits

What's the best way to know how many emails are the right number of emails each month to send an audience?

I see emails from some businesses daily and from others monthly. How do they/we determine which strategy is best for send frequency without driving up unsubs?

TIA

submitted by /u/crucial_brett
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source https://www.reddit.com/r/Emailmarketing/comments/epcyot/knowing_your_limits/