How often do you send emails to your customers without feeling like you're bothering them?

How often do you send emails to your customers without feeling like you're bothering them?

We’ve tried to send weekly emails, bi-weekly, and monthly, and have ended up sending them only on special occasions, such as new product releases and Black Friday. Our customer base isn’t ready; thus, I have to take my writing hobby elsewhere, sad T_T

Sounds like a good learning with the a/b test on email cadence. Care to share what you’ve learned?