Apple Mac OS X Server (version 10.2.3 or later) - Manual (Page 411)

Mail Service 411
4 Choose “Limit to local users” from the pop-up menu, then click Save.
If you limit outgoing mail to local users, all the options in the Outgoing Mail pane are
disabled because they are not relevant to local outgoing mail.
Suspending Outgoing Mail Service
You can prevent the mail service from sending new outgoing mail. You could do this to
isolate a problem, or to prevent conflicts with another mail service running on your network.
To suspend outgoing mail service:
1 In Server Settings, click the Internet tab.
2 Click Mail Service and choose Configure Mail Service.
3 Click the Protocols tab and choose Use None from the pop-up menu.
4 Click Save.
Working With Settings for SMTP Mail
The mail service includes a Simple Mail Transfer Protocol (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.
Your mail service has settings for requiring SMTP authentication, sending mail via another
SMTP server, changing the SMTP response names, changing the incoming SMTP port
number, changing the outgoing SMTP port number, and enabling an alternate mail transfer
agent such as the UNIX program sendmail. You can also start Sendmail. All these tasks are
described in this section.
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 421.
Requiring SMTP Authentication
Your server can guard against being an open relay by requiring SMTP authentication. (An
open relay indiscriminately relays mail to other mail servers.) Requiring authentication
ensures that only known users—people with user accounts on your server—can send mail
from your mail service. You can configure the mail service to require secure authentication
using the CRAM-MD5 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 CRAM-MD5 method.
LL0395.Book Page 411 Wednesday, November 20, 2002 11:44 AM