Enable encryption in mail.google.com / GMail
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Open the Settings page
Click the Cog Button in the upper right corner. Select to the Settings entry from the drop down menu.
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Open the POP3 account settings
Select the Accounts Tab of the setting page. In the Check email from other accounts (using POP3): section select your account and click on edit info behind this account.
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Enable encryption
Re-enter the Password for this account, set the POP Server Port to 995 and activate Always use a secure connection (SSL) when retrieving mail. Save the settings by clicking to Save Changes >>.