strip Received and write to mailbox

As I receive messages from a certain list, I'd like to remove the
Received header from the message and then write it to a mailbox file
based on month in one shot.  Is the following recipe safe, or is there
a better way?

:0:
* ^TOsage-l
|formail -I Received: >> /archives/sage-l/sage-l.`date +%y%m`

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