If you need to use the mailing lists in Plesk you first need to enable Mailman or the Mailing Lists Manager. Mailman is not enabled until you create a  mailing list. For more information about creating mailing lists, see Adding a Mailing List in Parallels Plesk Panel.
 Warning: 
Plesk does not verify the email addresses so make sure they are correct before creating the Mailing List. 
 
To Enable Mailman Using Plesk 7.x, 8.x, and 9.x
    - Log in to Parallels Plesk Panel as admin.
- From the navigation pane, select Server.
- Under Services, click Set Up Mailman.
     Note: If the Set Up Mailman icon is disabled, you need to install the latest Mailman updates. Select the Updater icon to install the Mailman updates. 
- In the Set Up Mailman window, specify your administrator login information and click OK.
- After you create your mailing lists, log in via SSH to "root" and type this command:
/sbin/service mailman start For more information about logging in via SSH, see Log in to my server.
 
To Enable Mailman Using Plesk 10.x and 11.x in Service Provider View
- Log in to Parallels Plesk Panel as admin.
- From the menu on the left, click Tools & Settings.
- From the Mail section, click Set Up Mailing Lists Server.
- Type a password into New password, and then retype the password to confirm it.
- Click OK.
- After you create your mailing lists, log in via SSH to "root" and type this command:
/sbin/service mailman start For more information about logging in via SSH, see Log in to my server.
 
To Enable Mailman Using Plesk 10.x and 11.x in Power User View
- Log in to Parallels Plesk Panel as admin.
- Click the  Server tab.
- From the Mail section, click Set Up Mailing Lists Server.
- Type a password into New password, and retype the password to confirm it. 
- Click OK.
- After you create your mailing lists, log in via SSH to "root" and type this command:
/sbin/service mailman start For more information about logging in via SSH, see Log in to my server.