To resolve this behavior, create a new Send/Receive group in Outlook: Resolution for Outlook 2007 and earlier versions
This behavior can occur because of a damaged Send/Receive group within Outlook. When you start Microsoft Outlook, Outlook does not automatically perform a send and receive operation to download messages from the server. Applies to: Outlook 2019, Outlook 2016, Outlook 2013, Microsoft Outlook 2010, Microsoft Office Outlook 2007, Microsoft Office Outlook 2003, Outlook for Office 365.E-mail messages are not automatically sent or received at startup in Outlook
