Delivery failures, non-delivery reports (NDRs), bounces, and emails flagged as spam represent scenarios where a sent electronic message does not reach the intended recipient. These situations, characterized by an inability to ensure message arrival, can arise due to incorrect email addresses, server problems on either the sender’s or recipient’s end, or content filtering practices. For example, a bounce-back notification indicates a problem, such as a full mailbox or the recipient address being nonexistent, preventing successful delivery.
The consequences of failed email delivery range from communication breakdowns to business disruptions. Time-sensitive information may not be received, impacting decision-making and operational efficiency. Undelivered marketing campaigns lead to wasted resources and lost opportunities to connect with potential customers. Historically, email deliverability issues have spurred the development of authentication protocols, spam filters, and best practices aimed at improving the reliability of electronic correspondence and maintaining sender reputation.
