To set up your email account in Apple Mail, please use the instructions at:
https://support.apple.com/en-us/HT204093#setup
With the following Incoming and Outgoing mail server settings:
Account type: IMAP (or POP3)
IMAP (POP3) Hostname: mail.cpagardens.com
IMAP Prefix:
Port: 143
X Use SSL (checked)
Incoming Mail Server: mail.cpagardens.com
username: your_email@address.here
password: your_password
Outgoing Mail SMTP: mail.cpagardens.com
TLS Certificate: None
X Use default ports (25,465,587) (checked)
X Use Secure Socket Layer (SSL) (checked)
Authentication: Password
username: your_email@address.here
password: your_password