MSGID: 1:153/7001.0 5765b71d
-={ Sunday, 19 June 2016, 09:03:25 +1200 }=-

Hey Paul!

 PH> I don't really understand what this is all about

The original subject was;
some trails are happy ones, others are blue
whereas your reply was (and is);
Re: some trails are happy ones, others are blue

The Determinator sees that and deems it blue.  If you check the happy replies
you can confirm that they all contain the subject;
some trails are happy ones, others are blue

Life is good,
Maurice

... Don't cry for me I have vi.
--- GNU bash, version 4.3.42(1)-release (x86_64-atom-linux-gnu)