Automatic checks for new incoming and outgoing messages occur at several possible times, such as when you start Outlook and at automatic intervals as defined in Send/Receive Groups. By default, when your computer is online, email messages are sent automatically when you click Send.
At any time, you can override the automatic send/receive intervals to immediately send and receive messages.
Send and receive messages for all accounts
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Select the Send / Receive tab on the ribbon.
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In the Send & Receive group, click Send/Receive All Folders.
Keyboard shortcut To send and receive messages for all accounts, press F9.
To send all messages in the Outbox, but skip checking for new messages, use the Send All command instead.
Manually send and receive messages for only one account
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Select the Send / Receive tab on the ribbon.
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In the Send & Receive group, click Send/Receive Groups, point to the account for which you want to send/receive, and then click Inbox.