Emails get stuck in Outlook

I'm working in Outlook. When I log into my network in my second home, I can receive emails but when I send emails they get hung-up and stuck in the Outbox. Sometimes they get sent. Other times they don't get sent. I'm not seeing an error when I synch by toggling "Send/Receive All Folders". Comcast is not my internet provider here.

I can send/receive emails just fine when working at my network at home, which is also the network with Comcast as the high speed internet provider.