I just know that in GMail there is setting to check and import email from other email providers (for instance Yahoo! Mail, let say this is secondary email) into your GMail (lets say its primary email). So when you have incoming messages in the secondary email address then GMail automatically import those into your GMail inbox. The advantage is by using one GMail inbox we can check emails for more than one email address (other than GMail). In addition, for mail delivery, we can also use GMail to send, but the sender address is the secondary email address (Yahoo mail address) not the GMail address.
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