I'm not aware of any server that would alter headers in this way. Keep
in mind that doing so would be very likely to break any DKIM signature
on the message.
This type of randomization or manipulation is best done at the MUA
(email client) stage. Anything after that should really be leaving
those headers alone.
Another thing to keep in mind is that Postfix doesn't use, or care
about, these headers (exception: header_checks).
Peter
On 4/07/22 5:21 pm, [email protected] wrote:
Hello,
Few days ago I've stumbled on this gem:
https://twitter.com/gabsmashh/status/1542154330836553728
It made me wonder about headers manipulation so I have few questions:
- are you aware of email servers that can/will manipulate headers so that
recipients order is altered?
- would it be possible to randomize recipients order with some header rewrite
in Postfix?
Thanks,
patpro
