Hello. I have an older macbook pro using Yosemite and mac mail. Out of the blue yesterday, mail stopped sending my emails. They just sit in the outbox, no error message appears, nothing happens if I select and direct it to send them. I have 3 different email accounts (icloud, earthlink, and gmail) set up and it won't send any of them. No problem receiving mail. Nothing has changed, same internet connection, same computer, etc. I am able to send (using the same server) from my iphone. I have looked around, and see suggestions to delete and re-add my account, but when I go to do that I'm warned that all (existing) messages will be lost, which is not a workable solution for me. Plus, if it's all 3 of my accounts misbehaving, it does not seem like that's the problem. So, is it something with my server, or something within macmail? I'm not very computer literate so keep suggestions simple, please. And thanks for helping! Debbie L.