email is receiving, but won't let her send. Still wants to use bellsouth as it's server.

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You'll want to go to your email preferences under "Mail" in the menu bar then select the account to make changes to.  Since you only have one account setup in mail it should already be selected.  Now you'll see "outgoing mail server".  Select the smtp-server.carolina.rr.com server and check "use only this server".  Previous versions of mail may not have that option.  That should do it for you.