two and more names

[happys82]

Hi,dear teachers
can I address to two or more people in formal letter?

ex:
Dear Mr. AAA, Mr. BBBB, Mr. CCCC

[Rover_KE]

No.

Send each recipient a separate copy.

'Dear Mr AAA,'

If you wish Mr AAA to know that you have sent the others an identical letter, at the bottom of his copy, under your signature, write

'cc Mr BBB, Mr CCC.'