Resolved Unable to send email with Mail, how can I fix this?


macrumors 6502a
Original poster
Jan 6, 2013
Manchester, UK
I'm a bit of a technophobe but recently my Mail app on my Macbook has stopped letting me send email.

I receive email just fine but when I reply and send I get this:

Screenshot 2020-02-11 at 17.14.24.png

It's Outlook that I use, but I don't even know where to start with troubleshooting, can anyone help?
Last edited:


macrumors 6502
Jul 8, 2013
hit the connection doctor button and see what it says. my money is on an authentication error, i.e. a password change that needs to be updated in your mail client. You would go Mail > Preferences > Accounts and click on your account, then the Server settings tab. Make sure your password is correct, paying attention to the Outgoing Settings (SMTP) in particular. Post a screen shot if you can.