To migrate Comcast emails to Gmail I would recommend you to use Mail Backup Tool on your system. The software can directly transfer Comcast emails to Gmail without any external help. It can move all email folders in a single attempt. Additionally, you can even choose folders for selective email migration. The tool preserves all email attributes and mailbox folder hierarchy as well during Comcast 365 to Gmail migration. It is compatible with both Mac and Windows OS. You can download its free demo version to check its working procedure.
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