On 08/12/2020 12:32, Mary via mailop wrote:
A solid idea, but you would have to avoid modifications to DKIM signed emails 
that sign the From header field via the h= tag as specified by RFC6376 secton 
5.4 and 5.4.1.

They aren't going to go any further once they will come in.   So I don't think any further DKIM checks will be done.

I'll DKIM check and then make the change before it drops into the mailbox.

--
Tim Bray
Huddersfield, GB
t...@kooky.org

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