You can open the Send/Receive Groups dialog by pressing the CTRL+ALT+S keyboard shortcut or as an alternative use:
Outlook 2007 and previous
Tools-> Options…-> tab Mail Setup-> button Send/Receive…
Outlook 2010 and Outlook 2013
tab Send/Receive-> button Send/Receive Groups-> Define Send/Receive Groups…
In the Send/Receive Groups dialog press the Edit… button.
In the left section, select the account for which you want to modify the send/receive settings.
In the Account Options section you can disable the option for “Receive mail items”.
Press the OK button until you have closed all open dialogs.
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