To better distinguish old vs new mail
Zora Zauner commented
@All: Use another Messages Theme Style (in Preferences / Appearance).
Ludovic Robert commented
Please vote for this idea : "Fade out the e-mail i have read (it is now not clear, which e-mails are unread and wich read)".
It's more efficient if everybody votes for the same one ;-)
Ralph Mestrom commented
To better distinguish read from unread mail a different background-colour, let's say darker grey for the unread ones, brighter for the news, would be nice.