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I have followed all this setup, but the message error message: "5.7.0 No AUTH command has been given" appears all the time when I try to send any email.
Sounds like you missed this step: "SMTP Authentication Required: Yes"
I know it's been a while, but this helped me. I've been trying to fix this for days. Thank you!
If anyone else comes to this post looking for an answer and is using iCloud, which means that there are no SMTP settings to be found - go to the iCloud account in System Preferences/Internet Accounts and disable Mail, then enable Mail again. That fixed the issue for me.
5.7.0 No AUTH command has been given
