Finding E-mails in different columns and trying to put them in one

[James]

I am trying to put all e-mails in one column that are in different columns.
Is there a formula to do that?

Example:
A B C
James [email protected]
Frank [email protected]

Want them all in Column A

 

[CurlyDave]

 I am trying to put all e-mails in one column that are in different columns.  
Is there a formula to do that?

Example:
                 A                   B                        C
James                         [email protected]
Frank                                                      [email protected]    

Want them all in Column A

You already have something in column A