[Dovecot] realtime backup with LDA?

[Stan Hoeppner]

On 2/24/2014 10:14 AM, Steffen Kaiser wrote:
...
> I mean to add a
> BCC per user to "user"_backup, like a per user alias or forward.
> 
> A message to user A is "split" into a message to user A and A_backup,
> where the new message to user A is not split again.

If using Postfix, this can be accomplished via two methods.

1.  /etc/aliases

If using local accounts, create a new mailbox and add it as a 2nd value
in the 'name: value, value' definition.  See:  aliases(5)


2.  /etc/postfix/virtual

If using a virtual(5) table, simply add a 2nd result (address) to each
pattern.


Using aliases(5), the 'X-Original-To:' and 'Delivered-To:' headers
remain intact.  Using virtual(5), these headers are rewritten to the
target address(es).  The latter shouldn't be a problem for your use case.

Each such address needs to be added to an access(5) table which will be
used with check_recipient_access to reject mail coming in via SMTP.  You
only want backup mail going into these mailboxes, not spam, not mistyped
addresses that may match the mailbox name, etc.

-- 
Stan