[Mailman-Users] 'from' header at delivered email from inside / outside organization

Hello Mailman experts,

I created a mailing list (i.e. abc@ml.abc.co.jp <mailto:abc@ml.abc.co.jp> ) with mailman in our organization.

Does anyone know how to configure mailman to achieve expected behavior?

Expected behavior:

a. When a sender is outside of our organization (abc.co.jp), the received mail should show original sender's email address at 'from' header. b. When a sender is inside of our organization and receiver is outside of our organization, the received mail should show ML address (abc@ml.abc.co.jp <mailto:abc@ml.abc.co.jp> ) at 'from' header.

I want to know sender's email address if it's from outside our organization but do not want disclose employees' email address in our organization when they send emails to outside our organization.

Thanks,

Toshi Kaneko