From Line feature function: extracts a "name" from the fromLine of
an email message and attempts to match any of its components with
the words in the target line
In other words, if a piece of the sender's name is detected in this line, it
returns true.
Signature File extraction Algorithm
It follows the description in "Learning to Extract Signature and Reply
Lines from Email", V.R.Carvalho and W.W.Cohen, CEAS (Conference of Email and Anti-Span), 2004
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