HP LaserJet 9000 User Manual page 38

The screen below shows an e-mail message to the printer requesting that
a configuration page be returned in HTML format:
The printer will check for new e-mail messages once every three minutes.
When the printer receives the e-mail message, it will generate a reply and
send the requested information back to the sender's e-mail address (as
specified in the From: field of the original e-mail message).
Note
Depending on delays in the network and your organization's mail server, a
response may take from one minute to several hours to arrive back in your
e-mail application's Inbox.
If the To:, From:, and Subject: fields are not properly formatted in your
e-mail message, the printer will not send a message in response.
34 Configuring the Printer with the Device Pages