I use several aliases in order to separate various vendors and accounts. I need to send them an email with source address of the alias. In the Compose window there is a "from" drop-down menu which allows me to select some of my Aliases, but not all. Can't seem to type the desired alias to be used as source of the e-mail.
From what I gathered from GoDaddy you cannot send an email from an alias unless you make that alias a user email like the principle email. In other words you have to pay for the extra email as a user to use it as "from" or "reply to"