I'm using contexts within mu4e, and I know how to add custom headers via the `mu4e-header-info-custom' list.
What I'd like to do, however, is to alter existing headers when replying or composing within certain contexts. Here's one example: if I reply to a message that matches one of these special contexts, I'd like the "To:" header to be automatically changed to a different address, or to add additional addresses to the "To:" line.
Suppose the sender is firstname.lastname@example.org. If I reply to the message, I'd like the "To:" line to automatically be changed to ...
... or even perhaps to ...
To: email@example.com, firstname.lastname@example.org, email@example.com
I might want to automatically change other existing headers, as well, such as "Subject:".
Is there any way to do this in mu4e?
Thank you very much.