Bulk email deliverability rates refer to the percentage of emails that successfully reach their intended recipients. Deliverability rates can be affected by a variety of factors, such as the quality of your email list, the content of your messages, and the reputation of your email service provider. Achieving high deliverability rates is essential for the success of your email marketing campaigns, as it ensures that your messages are reaching your target audience and driving the desired actions, such as website visits or purchases.