Apple Mail can't send emails but it can receive them just fine. I tethered all my email accounts a while back to Apple Mail when I was at my school's network and everything worked fine but as soon as I went back home for the summer and hooked up my Mac to my home network, I am unable to get Apple mail to send emails. It always says, "Cannot send message using the server____." and it prompts me to choose other Outgoing Mail Servers. I do, but those never work as well. I've had this problem for a long time and no, rebooting doesn't help. What am I suppose to change in the settings? Is it a conflict with the port? What do I do?