Go to the Send/Receive tab, click Send/Receive Groups | Define Send/Receive Groups and configure how often the All Accounts group does an automatic send/receive (it's probably set to 30 minutes).
Don't make it TOO often, or the system can bog down, but maybe you could set it for every 5 or 10 minutes. Then you don't have to do anything - the messages will update on that interval.
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