Hi Community,

I am currently working on a project for a transparent Rewrite Gateway which 
shall mask two independent Exchange Organizations behind a third domain. First 
I tried to solve this task by using a Postfix server, but Postfix was not able 
to rewrite the "From" and "To" the way the gateway is a completely independent 
black box, because incoming mail got a rewritten "To" field, but the mail was 
still delivered with the new domain suffix of which the internal mail server 
don't know anything from.

I used the following functions from Postfix:

  *   generic (outgoing - running fine except for meeting requests, which are 
ignored by the gateway)
  *   canonical (incoming - rewrite is done an mail gets transported fine, but 
the internal Exchange server receives a mail for @newcorp.com and loops it back 
to the gateway)
  *   header_checks (incoming - same behavior like canonical, the log looks 
fine but the mails get delivered with the wrong suffix)

Till now I was not able to solve my issues with Postfix and I hope, that Exim 
will be a better choice for my project. Can you tell me if it is possible to 
solve my issues with Exim to create a real rewrite gateway? If it is not 
possible, do you have some more information for me on why it can't be done?

My Gateway shall:

  *   Relay domains @internal1.com and @internal2.com to extern as @newcorp.com
  *   Rewrite incoming mails from @newcorp.com to @internal1.com or 
@internal2.com
  *   Transport mails to both internal organizations
  *   Exclude S/MIME encrypted and/or signed mails from rewriting
  *   Besides regular mail the gateway also needs to rewrite meeting requests 
and other types of mails coming from and to an exchange server

Thank you all in advance for your input and your thoughts!

With best regards
Dennis Weber
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