Apple Mac OS X Server Migration For Version 10.3 or Later Bedienungsanleitung PDF herunterladen (Seite 22)

22 Chapter 1 Mail Service Setup

Configuring Outgoing Mail Service

The mail service includes an SMTP service for sending mail. Subject to restrictions that

you control, the SMTP service also transfers mail to and from mail service on other

servers. If your mail users send messages to another Internet domain, your SMTP

service delivers the outgoing messages to the other domain’s mail service. Other mail

services deliver messages for your mail users to your SMTP service, which then transfers

the messages to your POP service and IMAP service.

If you don’t choose any method of SMTP authentication, the SMTP server will allow

anonymous SMTP mail relay. Requiring SMTP authentication requires authentication for

mail relay. Mail addressed to local recipients is still accepted and delivered. Enabling

authentication for SMTP requires authentication from any of the selected authentication

methods prior to relaying mail.

Your mail service also has settings that restrict SMTP mail transfer and thereby limit

junk mail. For more information on these settings, see “Limiting Junk Mail” on page 29.

Enabling Secure SMTP Authentication

Your server can guard against being an open relay by allowing SMTP authentication.

(An open relay indiscriminately relays mail to other mail servers.) You can configure the

mail service to require secure authentication using either the CRAM MD-5 or Kerberos

method. You can also allow the less secure plain and login authentication methods,

which don’t encrypt passwords, if some users have email client software that doesn’t

support the secure methods.

If you configure your mail service to require CRAM MD-5, mail users’ accounts must be

set to use a password server that has CRAM MD-5 enabled. For information, see the

Open Directory administration guide.

Before enabling Kerberos authentication for incoming mail service, you must integrate

Mac OS X with a Kerberos server. If you are using Mac OS X Server for Kerberos

authentication, this is already done for you. For instructions, see the Open Directory

administration guide.

To allow secure SMTP authentication:

1 In Server Admin, select Mail in the Computers & Services pane.

2 Click Settings.

3 Select the Advanced tab.

4 Check CRAM MD-5, or Kerberos (as desired) in the SMTP section.

5 Click Save.

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Apple Mac OS X Server Migration For Version 10.3 or Later Bedienungsanleitung Seite 22