I'm debugging a website and everytime there is an error an e-mail containing details is sent to me. Sometimes I have to click "send/receive" when I expect an e-mail and haven't got it.
In Outlook 2003: Select Tools > Send/Receive > Send/Receive Settings
In Outlook 2007:
Select Tools > Options > Mail > Send/Receive
In Outlook 2010: File> Options> section Advanced> button Send/Receive…