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Access the secondary mailbox, open the Settings section, select Forwarding and POP / IMAP and enter the address of the main mailbox.
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Go back to the main account, go to Settings , select Multiple Inboxes and enter the command to: xyz@gmail.com (secondary email address) into Pane 0 and other e-mail addresses on the next Pane if there are multiple Gmail accounts. .
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At this point, the new email of the secondary email will automatically show up in the main account in the right column. Google supports opening up to 8 new subdivisions in Inbox for users to conveniently view multiple mailboxes.
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The most obvious benefit of using the main Gmail account saves time. You do not need to switch your account anymore.
I wish you all success!