Apple Mac OS X Server (Administrator’s Guide) - Manual (Page 402)

402 Chapter 9
If your SMTP service does not use port 25, which is standard for incoming SMTP mail, enter
your incoming SMTP port number instead.
4 Add more new filters for the SMTP port to allow or deny access from other IP addresses or
address ranges.
For additional information on the firewall service, see Chapter 15, “Firewall Service.”
Working With Undeliverable Mail
Mail messages may be undeliverable for several reasons. You can configure your mail service
to forward undeliverable incoming mail, limit attempts to deliver problematic outgoing mail,
and report failed delivery attempts. Incoming mail may be undeliverable because it has a
misspelled address or is addressed to a deleted user account. Outgoing mail may be
undeliverable because it’s misaddressed or the destination mail server is not working.
Forwarding Undeliverable Incoming Mail
You can have mail service forward messages that arrive for unknown local users to another
person or a group in your organization. Whoever receives forwarded mail that’s incorrectly
addressed (with a typo in the address, for example) can forward it to the correct recipient. If
forwarding of these undeliverable messages is disabled, they are returned to sender.
To set up forwarding of undeliverable incoming mail:
1 In Server Settings, click the Internet tab.
2 Click Mail Service and choose Configure Mail Service.
3 Click the Messages tab.
4 Select “Forward mail addressed to unknown local users” and type a user name or group
name.
5 Click Save.
Limiting Delivery Attempts in Mail Service
You can limit how often and for how long your mail service attempts to deliver mail sent by
your users. If mail can’t be delivered within the time you specify, the mail service sends a
nondelivery report to the message sender and deletes the message. You can have the mail
service send an earlier nondelivery report. You can also have a nondelivery report sent to the
postmaster account.
To limit delivery attempts:
1 In Server Settings, click the Internet tab.
2 Click Mail Service and choose Configure Host Settings.