Q: I unchecked "Schedule an automatic Send or Receive every X minutes" under the options menu, but Outlook seems to automatically be checking for mail.
1. Open the Send/Receive Group dialog box.
2. In Outlook 2010 and 2013, click Send/Receive Groups > Define Send/Receive Groups under Send / Receive tab
3.In the Send/Receive Group dialog box, please select the All Accounts in the Group Name box. Then uncheck the Include this group in send/receive (F9) and Schedule an automatic send/receive every X minutes boxes in Setting for group “All Accounts” section. And uncheck the Include this group in send/receive (F9) box in When Outlook is Offline section. Finally click the Close button.
Then the send receive won’t be enabled automatically when Outlook startup.
Note: After uncheck the options above, the Send and Receive function won’t be displayed when Outlook startup, even you manually click the Send/Receive All Folders button. But you can still send emails through the email accounts by clicking the Send button, and receive email when it arrives.