I want to change my email display name in Gmail, and have gone into Settings/Accounts/Send email as. I changed my display name, and went to Next step, where I put in my username and password, and got a message:
Authentication failed. Please check your username/password.
[Server response: DNS Error: Address resolution of smtp.mydomain.com. failed: Domain name not found code(0) ]
Which username and password should I be using? I've tried the ones for my Gmail account, and also the one for Dreamhost, and neither work (though they do work to get into Gmail and my Dreamhost respectively). Any suggestions please?