Mulberry 3.0.3
Secure Email Setup for Mac  

1. Go to File > Preferences.

2. In the Remote Preferences box, click the Advanced radial button on the right-hand side.

3. Click the Accounts button on the left.

4. Under the Authentication tab, click the Method drop-down and select Plain Text. Set the Secure drop-down to SSLv3.

5. From the Account drop-down, choose SMTP.

6. From the Method drop-down, select Plain Text. Set the Secure drop-down to STARTTLS - SSL. 

7. From the Account drop-down, choose IMSP.

8. From the Method drop-down, select Plain Text. Set the Secure drop-down to SSLv3.

9. From the 'Account:' drop down choose LDAP.

10) Set the Method drop-down to Anonymous.

11.) Click OK. You have successfully configured Mulberry to be secure.