Even though it's not exactly what management wanted, they like the outcome anyway.
To allow Clients access E-mail prior to authentications
Per Colin I modified the Captive Portal User Role and added
Security > User Roles > Edit Role(cp-logon)
any host [External IP for Mail Server] svc-https permit
any host [External IP for Mail Server] svc-http permit
To default the user to our homepage after authentications (but not only when the client's browser has no default website set)
Per kdisc98 I modified the
Security > Authentication > L3 Authentication>Captive Portal Authentication Profile and in the "Welcome page" field I entered in http:// and then the website. Where I was going wrong before was I didn't add the "http://"
Crossing my fingers that there are no additional requests from management. :smileywink:
Thanks Colin & kdisc98!!