Hi
Log on to the computer on which the MS Outlook 2013 is installed, but having issues as discussed above.
Initialize the MS Outlook 2013 program by double-clicking its icon.
On the opened interface, go to the FILE tab.
From the displayed list, go to the Options option.
On the opened Outlook Options box, from the left pane, click to select the Advanced category.
From the right pane, under the Send and receive section, check the Send immediately when connected checkbox.

Once this is done, click OK to save the changes that you have made and to close the Outlook Options box.
Close and reopen the MS Outlook 2013 program in order to allow the changes to take effect.
If the issue still persists, restart the computer and then try again.