> 
> 
> As mentioned by Peter, we can use ranges_overlap() to improve the
> code readability. Other than that, looks good t me.
> 
> btw, not sure only me or not, but the message does not display
> correctly in mutt, seems not a plain text message, but looks fine in
> outlook.
I am not sure as well, but it shows properly on the mailing list. 
> 
> Fan

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