Postfix/Dovecot hide "to" address for alias

Michal Pastor · 05-07-2015, 05:42 AM

Hello,

I have a question, how can I rewrite "to" addresses in mail headers, if the address is an alias?

Example... I have address all@my.company - alias for all employees. I don't want to everybody know that address, so is there a way, how to rewrite on delivery every use of "all@my.company" to real email address of recipient, or at least something like "hidden_address"?

Thank you

lazydog · 05-08-2015, 07:05 AM

Michal Pastor · 05-11-2015, 01:04 AM

No, BCC can hide additional addresses, but I want to hide one address, which is alias for more addresses. In the headers there is still visible original "to" address even if it is BCC.

lazydog · 05-11-2015, 07:31 AM

Doesn't matter the TO: address will be left blank and the BBC will still send out the mail.

Michal Pastor · 05-11-2015, 08:42 AM

Code:

Return-Path: <sender@sender.domain>
Delivered-To: mymail@my.domain
Received: from localhost (localhost [127.0.0.1])
	by mail.my.domain (Postfix) with ESMTP id 607D9ABA36
	for <ALIAS@my.domain>; Mon, 11 May 2015 15:38:04 +0200 (CEST)

This is what I am talking about.... how to prevent show alias in header? This is part of header, ALIAS@my.domain was in BCC. I know, I can make list of recipients and use it in my client in BCC field, but alias is generated automatically for all mailboxes in my domain, so when I create new mailbox, there is no need for manage some lists, groups etc

lazydog · 05-11-2015, 09:45 AM

Not sure how much plainer I can state this. Do not use the TO: field. Use the BBC: field. Then the recipients will not see your Alias.

Michal Pastor · 05-12-2015, 12:51 AM

The address of alias in log IS in BCC, TO is to myself.

lazydog · 05-12-2015, 09:51 AM

OK, you got me lost now. BBC are not shown in the headers. If you are seeing the alias in the TO field then you or your program are placing it there.

Michal Pastor · 05-13-2015, 01:16 AM

BCC is shown in headers only if I send e-mail to alias from outside and only for addresses in this alias... If I send it to my alias ALL@my.domain and person@other.domain , both as BCC, person can not see ALL and ALL cannot see person, but every member of ALL can see, that original message is sent to ALL and this is what I want to hide. I have one external application, which need to send some message to this alias.

lazydog · 05-13-2015, 10:53 AM

I am not sure I am not understanding what you are trying to say or you are not understanding what I am saying.

With BCC the recipients will not see your BCC field thus your alias is protected from them.