So in postfix you'd do something like this? (under header_checks)

/^From:.*<(.*)>/ REPLACE From: $1

I wrote that in my email client, so I don't expect my regex to work. I guess it 
would be fun to see how much damage I can do with something like that...



On Tue, 8 Dec 2020 13:09:16 +0000 Tim Bray via mailop <[email protected]> wrote:

> 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
> [email protected]
> 
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