Thanks a lot,
Just for reference, if someone else is looking to send emails from Java via SMTP, use com.sun.mail.smtp.SMTPMess
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Question
Keep Return-Path header in Postfix
We use Postfix to send emails from Java (Tomcat). We want to give each outgoing message a unique Return-Path header, so that our system automatically can register bounced email addresses.
For example, when I send an email to test@somewhere.com I want to use a Return-Path as 1234-ieh9fj83oiu@bounce.my
I set the unique Return-Path header in the email in Java, before passing it on to Postfix through an SMTP connection. I have logged the outgoing message, and it has the correct (unique) "Return-Path" address.
However, when the email arrives to the recipient the Return-Path is set as support@mydomain.com. This is the email address used in From. It seems that Postfix automatically resets our custom Return-Path header with the From header.
I believe this is in line with the SMTP guidelines, when an SMTP server gateway sends an email it should reset the Return-Path header.
How can I configure Postfix so that it does NOT change the Return-Path header for my own emails?
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by: kevin_uPosted on 2009-07-18 at 14:56:14ID: 24887482
Return path is something that the MTA (in your case postfix) will always replace with whatever it received in the MAIL FROM: during the SMTP exchange, and not what the headers say.
So can you Java smtp api actually specify the from address (the "envelope from", not the "From:" header)? Your trick is to put your code into the api in a way that makes it put that into MAIL FROM: during the smtp conversation.
The from in the mail headers aren't used (sometimes they are adjusted) by the MTA.
You might also try adding a X-Errors-To: and Reply-To: headers. Some MTA's will use them.