Set the ‘Outgoing Mail Server’ section to the right to iCloud.Launch Mail and open Preferences>Accounts.Once this process completes, click on the box to turn Mail back on, and close System Preferences.Open System Preferences>iCloud and unclick the checkbox beside Mail to disable it.If you can’t send email using your iCloud account after upgrading to El Capitan then following these steps may help:
VerifyĪpple offers a simple online tool to verify your email settings so you can ensure they’re set correctly in Mail.
If you’ve been suffering problems using Outlook with El Capitan, then you should download the latest software patch released by Microsoft last week.
You can also explore some of Mail's hardest to find controls in this article here.
