To configure the Mac OS Mail client app to connect to your mailbox please use the following steps inconjunction with the Incoming (IMAP) and Outgoing (SMTP) server details provided to you:
Step 1 - Open the Mail app
Step 2 - Click the Mail menu then Preferences
Step 3 - Click the Accounts tab
Step 4 - Click the + (plus) symbol located towards the bottom left
Step 5 - Select Other Mail Account... account as the provider then click Continue
Step 6 - Enter your Name as you wish it to appear to recipients, enter your email address and password details as advised or created by you via the control panel
Step 7 - Click Sign In
Step 8 - Unable to verify account name or password will display
Step 9 - Re-enter your email address in the User Name fieldEnsure the Account Type is specified as IMAP
Step 10 - The Incoming Mail Server and Outgoing Mail Server fields should be completed using the information provided in your 'welcome' email
Step 11 - Click Sign In
Step 12 - After a few moments you will see a prompt asking if you would like to store Mail and Notes in this account. Leave both ticked then click Done
Step 13 - Click the Server Settings tab located to the right of the screen
Step 14 - Go to the Outgoing Mail Server (SMTP) section and untick the Automatically manage connection settings option to reveal additional options
Step 15 - Ensure that the User Name and Password fields are both completed, if not re-enter your email address and password
Step 16 - Ensure the Port is set to 587 and that Use TLS/SSL is ticked
Step 17 - Finally,verify that Authentication is set to Password and close the Accounts window using the red dot located at the top left of the window