salutation in a formal letter or e-mail

[stefilla]

What is the best way to start a formal letter or e-mail if I have to write to my colleagues and bosses the same letter, and I call bossess by their first names? Should I start by the bosses' names and then add "dear collegues"?:

Dear John, Kate, Michel, Mario, dear colleagues,

or rather use just the general salutation?:

Dear colleagues (including bossess)

[Anglika]

What is the best way to start a formal letter or e-mail if I have to write to my colleagues and bosses the same letter, and I call bossess by their first names? Should I start by the bosses' names and then add "dear collegues"?:

Dear John, Kate, Michel, Mario, dear colleagues,

or rather use just the general salutation?:

Dear colleagues (including bossess)

Welcome to the forums.

If this is an e-mail sent to all these people, do you need a salutation? They are in your office.

If you feel you do, then "Dear all" or Dear everyone". Send the e-mail to your bosses, and cc to your colleagues.