Getting the original Delivered-To address

yarri

I have a mailbox named, for example, exemplarius, and an email address *@exemplarius.com to catch all incoming emails sent to @exemplarius.com. This catch-all address is connected to that mailbox.

Now, when I send an email to the following recipients:

To: addr1@exemplarius.com
Cc: addr2@exemplarius.com
Bcc: addr3@exemplarius.com

three separate messages appear in the mailbox. This is expected and works fine.

The issue is that all three messages have the following headers:

X-Original-To: exemplarius@imap2.de.opalstack.com  
Delivered-To: exemplarius@imap2.de.opalstack.com

Is there a way to retrieve the actual recipient addresses for each message?

Ideally, each message would include a header indicating which address it was originally delivered to, like so:

In the first message:
X-Original-Delivered-To: addr1@exemplarius.com

In the second message:
X-Original-Delivered-To: addr2@exemplarius.com

In the third message:
X-Original-Delivered-To: addr3@exemplarius.com

sean

yarri at the moment that's not possible on our setup. I'll open an internal ticket to see if we can populate X-Original-To with the recipient address.

In the interim you might be able to get the recipient from the Received header for the second-to-last hop, ie the header with "Received from xxxxx.com by mx1.de.opalstack.com .... for addr3@exemplarius.com".

yarri

sean Sean, thank you for your attention and for the internal ticket opening.

Ufortunatelly, I am not able to retrieve the desired information from the Received header. The "for ..." part is missing. This was something I had already researched.

Received: from mx1.de.opalstack.com (mx1.de.opalstack.com [139.162.189.90])
by imap2.de.opalstack.com (Postfix) with ESMTPS id 5BA232037A7B2A;
Thu, 10 Jul 2025 10:45:02 +0000 (UTC)
Received: from mail-ej1-x62c.google.com (mail-ej1-x62c.google.com [IPv6:2a00:1450:4864:20::62c])
by mx1.de.opalstack.com (Postfix) with ESMTPS id 2781662409;
Thu, 10 Jul 2025 10:45:02 +0000 (UTC)

sean

yarri if the "Received" header doesn't contain the info then you're out of luck for now. I'll follow up here if we're able to sort this out on our end.