Sounds good to me; there's probably a list of forms of address somewhere on the Internet. Incidentally, in this case you wouldn't use 'Dear'.
b
PS It's a good idea not to use the same title for two posts made at about the same time. One way of avoiding the problem in this case would be to distinguish between a 'salutation' (at the beginning) and a 'valediction' (at the end), though I know - more's the pity - the modern trend is in favour of not bothering.