mail from: in process()?

["Marek Kowal" <marek.kowal@portal.onet.pl>]

Hello,
 
How can I access 'mail from' envelope header from within process()
function? Based on some special adressess of the senders, I would like
to provide special processing of the files with the messages. $(get
envelopeinfo ...) does not work, such key (from) is not there...
 
Please, do help ;-)
 
Thanks,
Marek

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