[rab] "Dear Sir or Madam, as the case may be:" Although in email I never use any salutation at all.

[Raak] Why not? [All others] What about you? Do you use salutations in email?

[Néa] Just the custom I'm accustomed to (and therefore the One True Way).

I use 'Good morning [name] or sometimes just 'Good Morning' (or afternoon), or sometimes 'Dear [name] in an email; if it's a round-robin (which is often is) I just start with an attention-grabbing 'Ladies and Gentlemen' which seems to go down fairly well, apart from with one individual who has been making a fool of herself recently and is not much longer for this corporate world, I feel.
[Rosie] A gay couple. With stupid parents. :oP

[Néa, from whom all knowledge springs, from whose navel a lotus springs forth and who encompasses the oceans in three strides] I avoid salutations as unnecessary ornamentation.