When I try to send a new email or use the Sharing option to email a selected web page, it opens up a new email window, though I am not able to select from all of my email accounts that are setup in Mail to designate as the sending account. I go to the drop down that allows you to choose which email account to send from, though all of my accounts will not display. I have accounts entered in Mail for: Gmail Gmail Yahoo iMap iMap iCloud I only have access to send email from: @me.com @icloud.com one of my Gmail accounts It seems to be downloading the mail for all of the accounts. I tried this on a new iMac with El Capitan and on a new Macbook with El Capitan, both have the same problem. It seems that the first Gmail account works, though when I add the second, it does not show up as an available option for sending emails. And the Yahoo and iMap accounts do not show up as options either. Any guesses to what is going wrong? Thanks!