[gentoo-user] [Sendmail]Relay only one specific mail address and REJECT any other

[Kan-I Jyo]

Dear list,

By taking a look into the sendmail README, it has come up to my mind
if I can relay only one specific mail address and REJECT all other mails
from {any_user}@whatever.domain.

Here is my test environment:

+---------+                            +-----------+
          +-----------+
+ MUA  +-------(SMTP)------+ MTA_1 +------(RELAY)------+ MTA_2 +
+---------+                            +-----------+
          +-----------+

MTA_2 above is set as teshost2, which is the destination of relaying.

Following lines have been put into the /etc/mail/access in MTA_1.

<code>
localhost.localdomain           RELAY
localhost                       RELAY
127.0.0.1                       RELAY
To: testuser@×××××××××.testdomain    RELAY

After editing, 'makemap hash access.db < access' has been
issued to rebuild the access database.

The mail relay works fine while all other mails like
testuser{2,3,4}@testhost2.testdomain
get relayed as well.

My question is, if it is possible, is there some kind of settings
within sendmail
(sendmail.mc / access / etc.) could meet my needs?

Any comment would be greatly appreciated.
-- 
Sincerely,

Jyo