[Salutations] For email, even formal email, I find that "Hello," is a perfectly good opening for almost every purpose. So much so that I now find it slightly quaint to receive an email that begins "Dear..." (particularly if the person uses my surname). And it's been many a year since I've seen a "yours faithfully". If forced into a formal signoff, I tend to stick to just "Yours," for fear of writing something I don't in the slightest bit mean, such as "sincerely".
[Dear Mr B-----,] While I am familiar with the feeling whereof you speak re: addressing someone by their first name prior to a formal introduction, which no doubt is deplored in Debrett, I can't say I've experienced a great deal of discomfort in discarding the convention.
In emails, I use "yours faithfully", "your sincerely", "regards" or "kind regards" depending on the context. I also use "cheers", which I use as a multi-purpose word in spoken coversation anyway. However, at the start of an email, I tend just to use the person's name (surname if we're not acquainted, forename if we are) or "Dear Sir or Madam" if it's to "complaints@????.com" or "service@????.com" (as many of my emails are).
Now I come to look at it, Christine seems such a silly name. It's like the brand name of a sort of mini-Messiah individually wrapped for your comfort and convenience.