How to Enable TLS for SMTP Server in Zimbra

First, become user zimbra:

# su zimbra

Set postfix’s smtpd_tls_security_level to may by:

zmprov ms  mail.server.com zimbraMtaSmtpTlsSecurityLevel may

or

zmprov modifyServer mail.server.com zimbraMtaSmtpTlsSecurityLevel may

After done, restart MTA server by:

# zmmtactl restart

 

How to Disable TLS for SMTP Server in Zimbra

First, become user zimbra:

# su zimbra

Set postfix’s smtpd_tls_security_level to none by:

zmprov ms  mail.server.com zimbraMtaSmtpTlsSecurityLevel none

or

zmprov modifyServer mail.server.com zimbraMtaSmtpTlsSecurityLevel none

After done, restart MTA server by:

# zmmtactl restart

 

How to configure Outlook for Zimbra Account

Account Setup

Choose Manually configure server settings or additional server types and click Next.

Internet Email Settings

Your Name:
Your real name.
E-mail Address:
Your email address for this account.
Incoming mail server:
This is the internet location name of your incoming mail server.
Outgoing mail server (SMTP):
This is the internet location name of your outgoing mail server.
User Name:
This is the login name for your email account.
Password:
Enter your password if you want Outlook to remember it for you. Remember Password must be checked for you to enter your password.
Remember Password:
You may choose to save your password to avoid entering it every time you check your email.
Require logon using Secure Password Authentication (SPA):
Make sure this is turned off. Penn does not support SPA.
More Settings…
To set up a secure connection click this button to continue.

More Settings

Outgoing Server

My outgoing server (SMTP) requires authentication:
Be sure to turn this on.
Use same settings as my incoming mail server:
This setting should be used for your Penn-provided Zimbra account.

Advanced

Incoming server (IMAP):
This value should be 143. It should be automatically set by Outlook.
Use the following type of encrypted connection:
Use “TLS” encryption.
Outgoing server (SMTP):
Port 587 is recommended.
Use the following type of encrypted connection:
Use “TLS” encryption.
Server Timeouts:
The maximum value (10 minutes) works best for both on-campus and off-campus access.
Root folder path:
This is the mail folder location on your email account. Set to blank.

Click OK once you are finished.

Test Account Settings

Click Test Account Settings… once you have made all necessary configurations. If you did not tell Outlook to remember your password, you will be prompted to enter it now.

If everything is correct, you should see a screen like the one below. Close the Test Account Settings window, then click Next to finish the setup process.

If the test fails, recheck the configuration settings and try again. If it still fails, contact your LSP or account administrator.