Kishor,

> I am running sendmail on a RHEL ES 4.0 with amavisd-new dual-mta setup
...
> 1. The primary mta-rx does not reject the mails for unknown recipients for
> the local domain but rather forwards it to the amavisd-new and in turn to
> mta-tx where it gets a user unknow and generates bounce message to the
> sender

> I want to have the unknown recipient e-mails rejected at the mta-rx

You must teach mta-rx to reject mail to unknown local recipients.
One way of how to do it is described in README.sendmail-dual ,
search for:
  "To make MTA-RX reject mail for nonexistent local users by itself"

As Tony Earnshaw commented, this feature comes naturally
when using Postfix.

> 2. Problem two I cannot send the mail with just username without a domain
> name where I get a mx loop back error from the port:10025

> My users should be able to send mail to local users without the domain
> name

Teach mta-rx to append local domain if domain is unspecified.
I must admit I don't know offhand how to do it with sendmail without
checking the documentation (with Postfix this comes automatically).

From Tonni:
| Furthermore you wouldn't need a dual MTA setup.

Yes, although the Postfix setup essentially _is_ a dual-MTA setup,
but with a single spool and a single config file. It certainly makes
things easier that way.

  Mark


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