How to Transfer Mails from one Email Account to another.

For Gmail to Gmail the best method is POP, not IMAP.  IMAP is best for other services like outlook (as mentioned) or for syncing to multiple devices (such as your cell phone). 

Below are instructions for a POP connection

In the original Gmail account.

1.  Go to Mail Settings

2.  Click the "Forwarding and POP/IMAP" Tab

3.  In the POP Download section, click "Enable POP for ALL MAIL".

4.  Save Changes

In the new Gmail account.

1.  Go to Mail Settings

2.  Click the "Accounts and Import" Tab

3.  In the "Check mail using POP3" section, click "Add POP3 email account" button.

4.  In the popup window, enter the original email address.

If you have a Google Apps Account, STOP, read the lower instructions.

5.  Enter your original gmail username without @gmail.com.

6.  Enter your original gmail password.

7.  For POP Server leave it as pop.gmail.com or pop.googlemail.com

8.  For Port, 110

9.  Read through the checkbox options if you want to use them for your settings.

10.  Click "Add Account"

This will prompt you further, it should ask if you want to send mail as the original account address, you may choose that based upon your preference.

5.  Enter your original google apps username with domain (i.e. example@domain.net)

6.  Enter your original google apps password

7.  For POP Server change it to pop.gmail.com or pop.googlemail.com (if those don't work try the default option it gave)

8.  For Port, change it to 995

9.  Read through the checkbox options if you want to use them for your settings.

10.  Click "Add Account"

This will prompt you further, it should ask if you want to send mail as the original account address, you may choose that based upon your preference.

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Thanks! Will this actually transfer over all my OLD sent email and chat history to the new address though? Or will this method just apply to future sent/received email?

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There are two options within the original gmail that you can choose from, one is Enable POP for ALL mail, the other is Enable from now on.  So if you choose that first option, it should transfer all mail, including sent mail to the new account.  I'm fairly certain it will transfer the chat history as well, as gmail basically saves those as a email anyway, but I'm not 100% certain on that.  Also, I won't lie to you, depending on how long you've had that old account, it may be a pain reorganizing everything, as it doesn't transfer your labels, but it's doable.

Also, be patient after you initiate the transfer, it takes several minutes to begin and, depending upon how much is in your original account, it could take several hours to complete.  It will transfer everything into your new inbox, based upon the dates of the emails.

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