Question about creating an email campaign


New Member
Hi all,

I have an email list of 26,500 email subscribers. These are all email opt ins or past purchases since 2014. I would say about ~12K have purchased in the last year. For those ~12k, i have each purchase segmented into a category which makes targeted email marketing based off previous purchase easy.
As I am new to email marketing, I am curious what the potential ROI could be off this list if I were to do an email campaign of 3-4 emails per month. Average purchase is about $50. Each email would generally offer a discount or incentive to purchase, or highlight items based off previous purchases. Also curious if anyone has any recommendations on how I should structure the email campaign.
This list has never been used, outside of the occasional black Friday sale email.
Any insights or advice would be appreciated.