How can I forward mail while saving a copy using postfix and mysql?

I'm migrating email from old Plesk installations to custom built Ubuntu server running iRedMail (postfix/amavisd/dovecot/etc).

I'm using postfixadmin to administrate all domains and a mysql backend. I've noticed that if I want to "alias" something or create a forward, I can not use an existing mailbox - so I can't copy over the Plesk-style "redirect with saved copy" feature.

I'm currently setting remote aliases via a database and using:

virtual_alias_maps = mysql:/etc/postfix/mysql_virtual_alias_maps.cf

If there is a way to still use my database it would be ideal - even if I have to add some columns, and change the query.

Thanks!

From serverfault FilmJ

• Do you have local accounts for all users?

  I've used a .forward file with something like:

  user@new-mail-server.example.com, \user
  

  which forwards a copy and keeps a copy in the local spool as well.

  FilmJ : I'm using mysql, and the domains do not have local accounts, only virtual mailboxes. Is there another way to do this using my database, ideally making use of: virtual_alias_maps = mysql:/etc/postfix/mysql_virtual_alias_maps.cf
  From djhowell

• It's probably more kosher to dispatch from postfix' main.cf:

  Say, in main.cf:

  ### let's archive some incoming/outgoing mail:
  recipient_bcc_maps = hash:/etc/postfix/recipient-bcc
  sender_bcc_maps    = hash:/etc/postfix/sender-bcc
  

  and in the relevant files (recipient-bcc and sender-bcc) for example:

  @sender.domain a.local@address
  

  Don't forget to (re)build the databases after editing the files:

  postmap hash:recipient-bcc
  postmap hash:sender-bcc
  

  FilmJ : So, I'm using mysql at the moment, so ideally I'd need to create something in the database - any ideas how to do this?
  From $pageUsers[$post.author].name

• I figured this out. Basically I need to modify the mysql table that saves the aliases so that it supports multiple aliases per address, making it possible to have delivery setup for both the local domain and a remote email.

  This works so far, though I've heard that some people attempting this have gotten duplicate emails to the forwarded email account. So far, I have not experienced this.

  I was using postfixadmin to manage the accounts, but it doesn't support this usage, so I've had to modify the source code, so that it both displays, edits and deletes aliases properly.

  The main lesson here is that when using mysql a single key can be mapped to multiple results, by setting a new primary key i.e. "id" but keeping your postfix query logic the same. The multiple results returned are the same as multiple results in the default dbm/bd files, except that you must create a new record with the same key rather than a single key with some kind of delimited result.

  HTH others!

  This should work with any maps in mysql.

  From FilmJ