On Sun, Jun 04, 2017 at 08:04:14AM +0200, Marek Kozlowski wrote: > On 06/04/2017 07:58 AM, Mark Scholten wrote: >> Hello, >> >> We have a few forwarders where we need to change the "mail from" >> during the SMTP stage. Nothing else has to change and I know that >> spam would be seen as coming from our mail server if we forward >> it. This last part is acceptable for us. On the mail server that we >> want to retire this is done (but this is Sendmail and difficult to >> maintain, so we want to switch to Postfix but keeping this >> behavior). >> >> Is it possible with Postfix to do this or do I need to look for a >> milter or something else to do this? > > canonical?
Pretty sure that PCRE header_checks will do that fairly effectively, it'll do a find and replace. Though admittedly my use of it is minimal; to remove the IP that gives away my physical location (so headers match mail sent via ssh session into the server without actually having to do that every time). That's a fairly trivial change since it just removes two headers. In your case you probably want to change the From and/or Sender, both of which should be achievable with header_checks. Maybe the Return-Path as well, but I'm not sure if it'll work on that. Regards, Ben
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