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Chapter 4 Monitoring and Maintaining Mail Service 85
Blocking Inbound Mail Connections
You can prevent Mail service from receiving inbound mail from external servers.
You might do this to isolate a problem or to prevent conicts with another Mail service
running on your network. You might also do this to stop virus propagation or a spam
relay originating from external servers.
Blocking inbound mail isn’t the same thing as disabling SMTP service. Disabling
prevents queued mail from being sent out, but blocking inbound mail stops accepting
connections to add mail to the queue. Attempted mail deliveries are bounced and
returned to the sender.
To block inbound connections:
1 In Server Admin, select a computer in the Servers list, then select Mail.
2 Click Settings.
3 Select the General tab.
4 Deselect Allow Incoming Mail.
5 Click Save.
Allowing Administrator Access to Mail Folders
You can congure IMAP to allow the server administrator to view the Mail service
hierarchy. Administrators cannot view mail itself; they can only view user folder locations.
When you connect as the IMAP administrator, you see user mail folders stored on the
server. Each user’s mailbox appears as a separate folder in your mail client. You can
remove inactive mailbox folders that belong to deleted user accounts.
For more information, see the man page for imapd.conf.
Creating an Administration Account
You might want to create a separate mail administrator account to maintain and
watch mail folders, remove defunct user accounts, and archive mail. This administrator
account doesn’t need to be a server administrator. Also, this administrator account
shouldn’t receive mail. It isn’t a normal mail account.
To create a mail administrator account:
1 Designate a user to be mail administrator.
You can create a new user in System Preferences > Accounts if you don’t want to use
an existing user.
2 Open /etc/imapd.conf in a text editor.
If you aren’t comfortable using a Terminal-based text editor like emacs or vi, you can
use TextEdit.