Can msed write labels or label edits to the original mail file?

[John Flood <jfloodcsc@gmail.com>]

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One of the reasons I became interested in mblaze was failure to get the 
editlabel <https://blitiri.com.ar/p/other/mutt-labels/> script to work with 
mutt.  When, e.g., cleaning up my INBOX it was easy with mutt to tag and 
move emails from the same address to a folder, but I also had emails, say, 
from various students that I would wish to move to a common "student" 
folder by first labeling them and then filtering for the label and moving 
them at once.

My question here is about msed which I was able to use to add a label (but 
not edit and existing one used by Gmail like one with "\Important").  
However, even though I could add a new label which would appear in the 
output of msed, the change did not seem to affect the actual email itself.  
If I used mhdr, the change would not appear.

So, am I expecting something that msed was not designed to do or is there a 
way to write the output of msed to the email itself.

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