thanks for the reply,
Does that mean i have to specify my domain and subdomain adress only.
Also as informed earlier our company is in email marketing business, when we send the email from our server (example.com), in the from option we specify the name of our clients domain rather than ours.
In the sence that although we sent the email from our end, the receiving person sees the clients name in the "from option" not our domain name (example.com).
In this case do we need to define the SPF for each of our clients or just for the domain from which we are sending because in one of the SPF forums i read that SPF also performs the 1st authentiction using "from name".
Plz let me know