Just another way to do things, but this one is most likely not as robust as your production data will command: 
my $data = do{ local $/; <DATA> };
my @parts = split( /(\w+:)/, $data );

shift @parts unless $parts[0] =~ /\w+:/;
for (@parts) {
    s/^\s+//;
    s/\s+$//;
    s/\s+/ /g;
}

use Data::Dumper;
print Dumper {@parts};

__DATA__
Warning bad news here
    Detail:              Some really nice infos these are
    Info:              This is a problem
                       but there is a solution
    Spec:              2nd of 4

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In reply to Re: Joining multiple lines together while parsing by Anonymous Monk
in thread Joining multiple lines together while parsing by Arengin

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