Apple Mac OS X Server Migration For Version 10.3 or Later Manuel d'utilisateur télécharger pdf (Page 29)

Chapter 1 Mail Service Setup 29

Limiting Junk Mail

You can configure your mail service to decrease the volume of unsolicited commercial

mail, also known as junk mail and spam. You can take steps to block spam that is sent

to your mail users.

You can also take steps to prevent senders of junk mail from using your server as a

relay point. A relay point or open relay is a server that unselectively receives and

forwards all mail addressed to other servers. An open relay sends mail from any domain

to any domain. Junk mail senders exploit open relay servers to avoid having their own

SMTP servers blacklisted as sources of spam. You don’t want your server blacklisted as

an open relay, because other servers may reject mail from your users.

Your mail service can do any of the following to reduce spam:

• Require SMTP authentication

• Restrict SMTP relay, allowing relay only by approved servers

• Reject all SMTP connections from disapproved servers

• Reject mail from blacklisted servers

• Filter SMTP connections

Requiring SMTP Authentication

If your mail service requires SMTP authentication, your server cannot be used as an

open relay by anonymous users. Someone who wants to use your server as a relay

point must first provide the name and password of a user account on your server.

Your local mail users must also authenticate before sending mail. This means your mail

users must have mail client software that supports SMTP authentication or they will be

unable to send mail to remote servers. Mail addressed to local recipients will still be

accepted and delivered.

To require SMTP authentication, please see “Enabling Secure SMTP Authentication” on

page 22, and “Enabling Less Secure SMTP Authentication” on page 23.

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Apple Mac OS X Server Migration For Version 10.3 or Later Manuel d'utilisateur Page 29