There are several factors that can lead to slow email delivery. Understanding these can help marketers address the root cause and improve their email campaign effectiveness.
Server Load: High volumes of emails being sent at once can overwhelm email servers, leading to delays. This is common during peak marketing seasons or large-scale campaigns. Recipient Server Issues: Sometimes, the delay is not on the sender's side but rather due to issues with the recipient's email server, such as maintenance or high traffic. Spam Filters: Emails flagged by spam filters may be delayed as they undergo additional scrutiny before being delivered. ISP Throttling: Internet Service Providers may throttle the delivery of bulk emails to prevent spam, resulting in delayed email delivery.