Using A Loop To Create A List Of Emails

I have a stored proc I am running, and I would like to create a list of email addresses from a table and put that list into a variable. I did a basic while loop to work on syntax, but now I don't know how to actually get each address added on. Here's how I started it

declare @start int, @testEmail nvarchar(2000)

set @start = 1
set @testEmail = NULL
while @start <= (Select count(PADM_Email) from PADM_Emails)
Begin
--Print @start
set @testEmail = @testEmail + (Select distinct PADM_Email from PADM_Emails) + ';'
set @start = @start + 1
End

I know that the above is wrong, but I don't know how to get it right. Ideally, I want the @testEmail to look like this:

emailaddress1;emailaddress2;emailaddress3;