MS Outlook is indeed an ultimate email client, which can be even configured to access Gmail accounts. However, one might face an issue of duplicate mails while sending a message with a Gmail account in Outlook. That means, the Sent Items folder will have two entries for the same sent mail item. This happens because of the fact that you are using an SMTP server of Gmail. As a result, both SMTP Gmail server and your Outlook will save one copy each.

To avoid such situation, the mails should be sent via the SMTP server of your own Internet provider (ISP) instead of the Gmail. Such solution may require more technical knowledge. However, there is always an easy way to disable the option of saving a copy of your Sent Items in your Gmail account.

For Outlook 2013

In order to disable this option in Outlook 2013, follow the below mentioned steps:
1.    Go to File-> Account Settings-> Account Settings
2.    Select your Gmail account-> button Change…-> button More Settings…-> tab Advanced-> option
3.    Choose 'Do not save copies of sent items'


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For Outlook 2010

In order to disable this option in Outlook 2010, follow the below mentioned steps:

1.    Go to File-> Account Settings-> Account Settings
2.    Select your Gmail account-> button Change…-> button More Settings…-> tab Sent Items-> option
3.    Choose 'Do not save copies of sent items'


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For Outlook 2007

In order to disable this option in Outlook 2010, follow the below mentioned steps:

1.    Go to Tools-> Account Settings…-> select your Gmail account-> button Change…-> button More Settings…-> tab Folders
2.    Choose the option 'Save sent mail in the Outlook Sent Items folder'

For Outlook 2003 and Outlook 2007

In case you need not want to save the messages in your local Sent Items folder, you can always disable the option to save a copy of your Sent Items.


However, you can create your own rules for all outgoing mails. For example, in order to store all sent messages to a particular address in a sub-folder within the Sent Items folder, following the below mentioned steps:

1.    Open the Rules wizard.
2.    Navigate to Tools-> Rules and Alerts (For Outlook 2007 and previous versions) or navigate to Home-> section Move-> button Rules-> manage Rules and Alerts (For Outlook 2010)
3.    Select "Start from a blank rule", "Check messages after sending" and press Next.
4.    Select "sent to people or distribution list" in the step 1 section.
5.    Click "people or distribution list" and select a particular email from your address book, in the step 2 section.
6.    Press Next
7.    Select "move a copy to the specified folder" in the Step 1 section.
8.    Click "specified" and select the email folder in the in the Step 2 section.
9.    Select "stop processing more rules" in the Step 1 section.
10.     Press Next until you get an option to set exceptions.
11.     Name the rule.
12.    Select and verify the "Turn on this rule".
13.    Press Finish.

You can create additional rules to move messages to other people to different folders by following the above-mentioned steps.