Why it shows -->Delivered-To: *ispusername@xyz.de* in email-header?

[tom]

Below you see the sourcecodefrom a usual mail. It shows the right email-address like admin@xyz.de but why it show in Delivered-To the ispusername in front of the domainname like web1_admin@xyz.de. I don't wanna tell the recipient the username of ispconfig.

Why it shows the ispusername?
How can I change it?

From - Wed Sep 27 12:57:57 2006
X-Account-Key: account5
X-UIDL: UID19-1158601422
X-Mozilla-Status: 0001
X-Mozilla-Status2: 00000000
Return-Path: <admin@xyz.de>
X-Original-To: admin@xyz.de
Delivered-To: web1_admin@xyz.de

[falko]

Why it shows the ispusername?

Because the system uses system users, and the username is web1_admin.

[tom]

Because the system uses system users, and the username is web1_admin.

That's right but I don't wanna show every recipient the username from ispconfig.
Can you explain how postfix uses the ispconfig username. Maybe there is a way to tell postfix to rewrite the name in the header.

[till]

This header is in the mails that you get and you know your own username as you use it to login with pop3 for example :) This header is not shown in mails that are sent to external recipients.

[gscaglia]

This header is in the mails that you get and you know your own username as you use it to login with pop3 for example This header is not shown in mails that are sent to external recipients.
But it's possible hide the Delivered-To in the mail's headers, because I believe that spamassassin (in the local mail-server, when downloads the mails with Fetchmail, from remote ISPConfig mail-server) increments the score for that reason.

Thanks a lot