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Open Gmail in your web browser.
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Click the gear icon in the top-right corner and select See all settings.
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Go to Accounts and Import.
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Click Add a mail account.
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Enter your Alternmail email address and password.(your_mail@alternmail.com)
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Configure POP settings:
Select "Import emails from my other account (POP3)" and click "Next".-
For username: your_mail@alternmail.com or just “your_mail”
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Enter your alternmail email address password.
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For POP server enter: mail.alternmail.com
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Choose Port: 995
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Adjust additional settings:
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Leave a copy of retrieved messages on the server (check it).
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Always use a secure connection (SSL) (check it).
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Label incoming messages (optional for easier filtering).
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Archive incoming messages (optional).
example:

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Click "Add Account".
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In case you didn't setup SMTP for your alternmail on this gmail account you will get an option to continue and configure it:
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Check "yes" if you want to configure it
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Check "no" if you just want to finish your POP3 setup
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