The most efficient way to transfer Comcast email to Gmail is by using a trusted tool like the IMAP Mail Backup Tool. You can migrate your Comcast emails either through a manual method or with the help of an automated solution. While the process may seem complex, this guide, “Easily Transfer Comcast Email to Gmail Without Data Loss”, covers both methods. For speed, accuracy, and minimal risk, the IMAP Backup Tool is recommended, while advanced users may opt for the manual approach.