Assume
your name is "William Tell" and your play alias is "GoldenArrow"...
This would make your primary email account goldenarrow@abattoir.net
and your secondary william.tell@abattoir.net All you have
to do is set up your primary account, anything sent to your secondary
account is forwarded to your primary; this is handy if you wish
to give someone your email address, but want to use your actual
name rather than your play alias.
Open
Outlook, on your top menu, go to:
TOOLS > OPTIONS > MAIL SETUP
> EMAIL ACCOUNTS...