Several factors can influence the speed at which emails are sent and delivered:
Server Capacity: The infrastructure of your email service provider (ESP) plays a crucial role. High-capacity servers can handle and distribute emails more efficiently. Email List Size: Larger email lists take more time to send to, especially if the ESP has to manage and throttle the sending rate to avoid spam filters. Content Complexity: Emails with heavy multimedia content or attachments may take longer to process and send. Throttling Policies: Some ESPs implement throttling policies to prevent overwhelming the servers or being flagged as spam.