I think it leads to emails going to spam, although Klaviyo told me that inbox providers pay much closer attention to the sending domain reputation versus the sender IP reputation.
My deliverability score is 84 based on data from the past 30 days (5,916,674 emails sent).
To solve my problem, I took the following steps:
First, I archived customers who never open my emails after a certain period. This helps improve your open rate.
Second, we group customers to manage daily emails, ensuring not to send too many emails to a single group. For example, if Group A receives emails today, Group B receives them tomorrow, with different emails for different groups.
Third, focus on your email subject and layout to improve engagement. A good marketing email should include compelling subjects and a beautiful layout.