Duplicate sent email message arrives Gmail Account

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It’s the problem that has puzzled some many of us BlackBerry users!  After setting up your BlackBerry device with your personal GMail account  you notice that you began to receive duplicate emails  O_O   What are you to do????
See how to resolve your duplicate sent email message arrives Gmail Account here (BlackBerry Knowledge Base KB10332)

Also, download the BlackBerry Email Application for BlackBerry  ( see video and download here)