Apple 10.6 manual Restricted Smtp Relay and Smtp Authentication Interaction

Restricted SMTP Relay and SMTP Authentication Interaction

The following table describes the results of using restricted SMTP relay and SMTP authentication (see “SMTP Authentication” on page 64) in various combinations.

SMTP requires authentication	Restricted SMTP relay	Result
On	Off	All mail servers must
		authenticate before Mail
		service accepts mail for relay.
		Your local mail users must also
		authenticate to send mail out.
On	On	Approved mail servers can
		relay without authentication.
		Servers you haven’t approved
		can relay after authenticating
		with Mail service.
Off	On	Mail service can’t be used for
		open relay. Approved mail
		servers can relay (without
		authenticating).
		Servers that you haven’t
		approved can’t relay unless
		they authenticate, but they can
		deliver to your local mail users.
		Your local mail users don’t need
		to authenticate to send mail.
		This is the most common
		configuration.

Rejecting SMTP Connections from Specific Servers

Mail service can reject unauthorized SMTP connections from hosts on a disapproved- hosts list that you create. Mail traffic from hosts on this list is denied and the SMTP connections are closed after posting a 554 SMTP connection refused error.

To reject unauthorized SMTP connections from specific servers:

1In Server Admin, select a computer in the Servers list, then select Mail.

2Click Settings.

3Select the Relay tab.

4Click the “Refuse all messages from these hosts and networks” checkbox.

5Edit the list of servers by choosing one of the following: ÂÂ Click the Add (+) button to add a host to the list.

ÂÂ Click the Remove (-) button to delete the selected host from the list. ÂÂ Click the Edit (/) button to change the selected host from the list.

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Chapter 2    Mail Service Setup