Ok i'm gonna go with:
Dear Mr X, Mr Y and Mr Z,
Blah blah
dear john doe should be fine.
what is the subject matter in the email? is it looking for work or just saying hi?
It's about a meeting i attended yesterday and how during the question period i asked a question but I think i might have asked it incorectly. I did not explain myself correctly and i now want to bring forward an idea. It will porbably not be taken very seriously but i think that at least they should realize that we have some good ideas about how to acheive our comon goals which is profitability and garanteeing our survival during these very competitive times.
I'm definitively not the best person to send in the email but i figured i'd let them know my ideas anywai.