“When should we send our mass email campaigns?” is one of the most frequently asked questions in email marketing. Many people believe that Tuesday through Thursday mornings are generally good times to send. This answer, however, may be more complicated, and, as with most email marketing questions, the answer depends on several variables including your specific situation. To determine the best time to schedule your email delivery, you need to break the questions down into three parts When do you want your list members to receive your email? What factors determine how long it takes for your emails to reach each list member? Does your ESP (Email Service Provider) have the necessary resources to send emails at a regular time continuously? Is there a formula that recommends the time to send mass email campaigns? Perhaps, here’s one that was developed on the following variables: Planned Open Time or POT ISP Component or IS Send Duration or SD Queue Aspect or QA Schedule Delivery Time or