How do I fix the connection to the outgoing server failed?
Enable Airplane mode in settings and then disable it, this sometimes fixes the error. Delete the account with issues. Next, create the account again as a new account, sometimes just re-creating the account fixes the issue. Try changing the Mail Days to Sync field to No Limit.
Why is my mail on Mac not sending?
Make sure the outgoing (SMTP) mail server is specified as directed by the provider of your email account. See Verify an email account’s outgoing server. Choose Window > Connection Doctor, then follow the instructions displayed in the Details column.
Are there any problems with mail in El Capitan?
There are still various El Capitan Mail issues that some people are having including mail not sending in El Capitan, mail not being received and many more frustrating bugs. On October 21st Apple released the El Capitan 10.11.1 update which claimed to have fixed Apple Mail problems with outgoing server issues and message display problems.
How do I Turn Off Mail on El Capitan?
Open System Preferences>iCloud and unclick the checkbox beside Mail to disable it. Once this process completes, click on the box to turn Mail back on, and close System Preferences. Launch Mail and open Preferences>Accounts. Choose iCloud. Set the ‘Outgoing Mail Server’ section to the right to iCloud.
Why is my iCloud email not working on El Capitan?
Apple offers a simple online tool to verify your email settings so you can ensure they’re set correctly in Mail. If you can’t send email using your iCloud account after upgrading to El Capitan then following these steps may help:
Why is my mail not working on my Mac?
A common issue with Mail is that plugins are no longer compatible with new versions of OS X and if you have several other plugins installed in the Bundles folder, we also recommend deleting them all in your Bundles folder until an update is issued. 4. Disconnect Online And External Mail Folders (especially iCloud)