Apple Mac OS X Server Version 10.4 or Later Manual do Utilizador descarregar pdf (Página 32)

32 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.

Enabling SMTP Access

SMTP is used for transferring mail between mail service and sending mail from user’s

email clients. The SMTP mail service stores outgoing mail in a queue until it has found

the mail exchange server at the email’s destination. Then it transfers the mail to the

destination server for handling and eventual delivery.

SMTP service is required for outgoing mail service, and accepting delivery of mail from

mail servers outside your organization.

To enable SMTP access:

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

2 Click Settings.

3 Select the General tab.

4 Click Enable SMTP.

5 Select “Allow incoming mail,” if desired.

If you allow incoming mail, enter the domain name to accept mail for, and the mail

server’s host name.

6 Click Save.

Understanding SMTP Authentication

If you don’t choose any method of SMTP authentication or authorized specific SMTP

servers to relay for, the SMTP server will allow anonymous SMTP mail relay, and is

considered an “open relay.” Open relays are bad because junk mail senders can exploit

the relay to hide their identities and send illegal junk mail without penalty.

A distinction must be made between relaying mail and accepting delivery of mail.

Relaying mail means passing mail from one (possibly external) mail server or a local

user’s email client to another (third) mail server. Accepting delivery means receiving

mail from a (possibly external) mail server to be delivered to the server’s own email

users. 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.

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Apple Mac OS X Server Version 10.4 or Later Manual do Utilizador Página 32