[S-mailx] view-msginfo doesn't affect most of my emails

[Χάρης Καραχριστιανίδης]

Introductional message info lines of emails that begin from top of the screen 
or emails that begin from some point of the screen but the screen above is 
blank are not coloured, while they are coloured when an email continous from 
previous one. Should it be this way?