usability - the style and content of the Subscription digest email is not very easy to read or helpful

I have just received an email digest for a post I submitted as someone has added an answer but it was not clear from the digest why I had received the digest or what had changed.

1) When reading the digest in Outlook it has poor layout and style

Main text is light green on white background - poor contrast

2) Not clear what has changed, ie what should I do as a result of getting this email

Would prefer something like

2 people have added a reply to your post on "subject xyz ...." read more ....

3) Would like a clear unsubscribe link (and or instructions at bottom of the email) as good practice