Apple Mac OS X Server (Administrator’s Guide) - Manual (Page 385)

Mail Service 385
4 Click POP3 Options.
5 Enter the DNS name you want your mail service to use when responding to POP
connections, then click Save.
Changing the POP Port Number
The standard port number for POP mail service is 110. You can specify a different port, but
do so carefully. If you change your mail service’s POP port number, you must also change
the POP port used by all users’ mail client software. Also, don’t use a port that is used by
another service.
To change the POP port number:
1 In Server Settings, click the Internet tab.
2 Click Mail Service and choose Configure Mail Service.
3 Click the Protocols tab and select Enable POP3, if it is not already checked.
4 Change the port number for the POP3 protocol and click Save.
Working With Settings for Incoming IMAP Mail
Internet Message Access Protocol (IMAP) is a client-server mail protocol that allows users to
access their mail from anywhere on the Internet. Each IMAP user’s mail remains in mailboxes
on the server, just as if it were on the user’s computer. IMAP delivers mail to the user’s inbox
as does POP, but when the user retrieves mail, it is not removed from the server.
The mail service has settings for requiring secure IMAP authentication, changing the IMAP
response name, using case-sensitive IMAP folder names, controlling IMAP connections per
user, terminating idle IMAP connections, and changing the IMAP port number. All these
settings are described in this section.
Requiring Secure IMAP Authentication
Your IMAP mail service can protect users’ passwords by requiring that connections use the
Challenge-Response Authentication Method MD-5 (CRAM-MD5). When a user connects with
CRAM-MD5 authentication, the user’s mail client software encrypts the user’s password
before sending it to your IMAP service. Before configuring your mail service to require
CRAM-MD5 authentication, make sure all users’ mail client software is able to authenticate
using the CRAM-MD5 method.
To require CRAM-MD5 authentication:
1 In Server Settings, click the Internet tab.
2 Click Mail Service and choose Configure Mail Service.