[pfx] Re: Sender rewrite for Azure SMTP

[Matthew Kitchin via Postfix-users]

On Thu, May 22, 2025 at 10:46 AM Wietse Venema <wie...@porcupine.org> wrote:
>
> How can I help? The purpose of my request is to find out if the
> unexpected display name change happens before Postfix receives the
> message, while Postfix processes the message, or after Postfix
> delivers the message.
>
I'm sorry. I just realized these replies were going to you and not the
list. Adding list back.
My path (for testing) is Thunderbird => Postfix => Azure SMTP => Corp
Outlook&Personal Gmail
I added the logging you indicated, and I don't believe we see any sign
of Posftix changing it. It is a very minimal Postfix relay server.
Case 1, Thunderbird sends as f...@example.com with display name John
Doe - all good.
Case 2, Thunderbird sends as fo...@example.com with this line in
main.cf sender_canonical_maps = f...@example.com
In case 2, header on received end now shows display name as "f...@exampled.com"
I am not doing any header manipulation in Postfix. The only config I
did is the smarthost to Azure with Auth and the one sender rewrite
rule.
I am happy to capture anything else. Were you expecting to see more
info from the header_checks?
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