Redirect Rule - Delivery has failed to these recipients or groups

First of all my apology if this is wrong Forum. Please guide me to correct forum.

Scenario is that we need to send emails to AD Group using C# code or script.

First we tried C# code and it don't work, as per our finds, log in / password is required. Also, it was taking to much time because of protocol  and we need to send 10 to 15 emails at same time.

We tried script and this time we created a mail box say, temp. We send emails to temp and added rules on bases of subjects of emails.

Now, issue is if we setup forward rule, temp is able to forward email to AD group. If we setup redirect rule, email is not send to AD Group and temp received failure delivery.

 We even made temp owner of AD group.

Any help?

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