Mumara, as an email marketing platform, typically creates the email content, including any images or attachments, and prepares it as an email packet. Once this packet is formed, it is handed over to the SMTP (Simple Mail Transfer Protocol) server responsible for sending the email out to the recipient's email server.
However, even though the SMTP server takes over the responsibility of delivering the email packet, bandwidth usage can still occur on the Mumara server during this process. This usage might include preparing the email content, storing attachments temporarily before transmission, and any data transfer between Mumara and the SMTP server.