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28 Chapter 1 Mail Service Setup
Choosing No Incoming Mail Retrieval
You can choose to enable SMTP mail service, but not supply POP or IMAP service for
incoming mail retrieval. If neither POP nor IMAP are enabled, incoming mail from other
mail servers will still be delivered to user, but users won’t be able to access their mail
with their email client applications.
Mail that has been accepted for local delivery will be queued until either POP and/or
IMAP services are enabled, delivery to /var/mail is enabled, or the message expires and
a Non Delivery Receipt (NDR) is sent to the sender (after 72 hours by default). If deliver
to /var/mail has been enabled, users can still access mail using UNIX mail tools such as
PINE or ELM. Messages delivered to /var/mail/ will not be available for delivery to users
with Cyrus, once POP and/or IMAP is enabled again.
If both POP and IMAP are disabled, you can change where incoming mail is stored from
its default location at /var/spool/imap/user/[user name] to /var/mail/[user name].
To change the local delivery directory:
1 In Server Admin, select Mail in the Computers & Services pane.
2 Click Settings.
3 Select the General tab.
4 Check “Deliver to /var/mail/...”
5 Click Save.
Enabling Secure POP Authentication
Your POP mail service can protect users’ passwords by allowing Authenticated POP
(APOP), or Kerberos. When a user connects with APOP or Kerberos, the users mail client
software encrypts the users password before sending it to your POP service. Before
configuring your mail service to require secure authentication, make sure that your
users’ email applications and user accounts support the method of authentication you
choose.
Before enabling Kerberos authentication for incoming mail service, you must integrate
Mac OS X with a Kerberos server. If youre using Mac OS X Server for Kerberos
authentication, this is already done for you. For instructions, see the Open Directory
administration guide for more information.
If you want to require either of these authentication methods, enable only one method.
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