Comment by marilyn

I have several email accounts for different domains set up with google apps. One is the primary one that I am always logged into, and the others I have set up as an account I can send mail from (Settings, Accounts, Add another email address you own) in the primary account. In addition, I set up a filters for each of the email addresses that label the incoming mail according to what address it was sent to, so I can easily identify which of my identities is getting the email.