[SOLVED] Return-Path changed after upgrade
I have upgraded Zimbra 5.0.10 to 6.0.1. Everything works fine except one thing. As username we have a local name like (example) email@example.com.
To send e-mail we use real email addresses. We have added these addresses through the option menu: email -> accounts we have a real email address like (example) firstname.lastname@example.org.
After the upgrade the Return-Path have changes. Before the upgrade the Return-Path was the real e-mail address used by the FROM field. After the upgrade the Return-Path have changed to the local email address a.k.a. the username. Because this is as a fake email address email is rejected by several mail servers.
Is there a way to manipulate the Return-Path? I think it has something to do with the Postfix configuration. But I can't find a solution.
Hope someone can help me with this.