On Thu, Jul 16, 2020 at 05:19:52PM +0200, Kai Bojens via Exim-users wrote: > Scenario: I want to archive customer e-mail. Right now I am sending
> copies through a router via "manualroute" and "unseen" which works
> perfectly fine.
>
> The only problem occurs when mails have multiple recipients like Bcc.
> The recipient of the mails must be rewritten to the same address (i.e.
> foobar@???) for the mailarchive to work – I use headers_add for
> adding "X-Envelope-To:" in order for the mail archive to distinguish
> them later.
You are doing something strange: get original mail with several addresses
and make several copies with a single-address X-Envelope-To: header.
Why so? Put all recipients into X-Envelope-To: and write copy into archive.
Such approach saves file space.
> The problem is that Exim recognizes these mails as the same and either
> sends one mail with multiple recipients or (when I add "max_rcpt = 1")
> sends multiple mails - but these mails are all the same, they only have
> the "X-Envelope-To:" of the latest redirection.
>
> Debugging the process shows:
>
> "[duplicate, would not be delivered]"
>
> As far as I understand this is expected behaviour and only within pipes
> mails are treated differently.
>
> tl;dr: how can I force Exim to actually create single and unique mails
> instead of just ignoring duplicates?
Unique mails MUST have unique Message-Id's. Some mail storage systems
(Cyrus, for example) remove duplicates by message-id automatically.
Nevetheless, you can pipe mail to you custom script written to create
several files, with the only difference in X-Envelope-To: header, but
for me it looks ridiculous.
--
Eugene Berdnikov
