Mail::Internet is a useful module for parsing email messages.

If you don't want the overhead of using modules, you could do something like: 

my $from;
while (<MAIL>) {
    my $mail = $_;
    chomp $mail;
    next unless substr($mail, 0, 6, '') eq 'From: ';
    $from = $mail;
    last;
}
print "Mail from : $from\n";

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In reply to Re: Extracting info by tomhukins
in thread Extracting info by HTTP-404

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