Howto extract subject from message

Hello,
I've just installed maildrop and I'm trying to get working sending of SMS to my mobile phone. I want sent only
SUBJECT and FROM fields not whole message and I think, that I can't use CC or TO command. I don't know, how to
extract SUBJECT, because FROM is builtin maildrop's variable as I understood by man page of
maildropfilter. 
Can you help me?

Ruda Wolf.

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