#0 Fyrst you click File
#1 There you click Add account.
#2 input the email address and press Advanced options check the Let me set up my account manually checkbox and then finaly click the Connect button.
#4 The form shall be filled as stated below:
Incoming mail
Server: mail.1984.is
Port: 143
Encryption method STARTTLS
Outgoing mail
Server: mail.1984.is
Port: 587
Encryption method STARTTLS
Then click Next.
#5 Input the password for the domain and click Connect.
#6 Finaly click done and the email address should have been set upp successfully.