Should you wish to permanently store the certificate and add it to the Keychain, you can check the Always trust box before selecting Continue.
Username also is the full email address.To edit the Incoming/Outgoing ports, UN-check Automatically manage connection. Edit the Host Name fields to match your DreamHost mail server name. The Accounts page opens: Click the Accounts option in the top bar. Email Address is the full email address you’re setting up. Open the Apple Mail application by clicking Mail in the top menu bar.You will need to ensure that all the fields are completed:.At this point, you should see an additional popup window with a place for you to add additional settings.On the Add a Mail Account screen, enter your name, the email address and the email account’s password.On the “ Choose a Mail account provider” screen, select the radio button next to Other Mail Account and click the Continue button.Launch Mail by clicking on its icon in the dock.