Some SPF and CNAME things I dont quite understand...

[danf.1979]

In the SPF configuration for a domain:
I Dont understand this -> "Are emails sent from all servers of this domain?" It doesn't make sense to me :)
Also -> "Inherit SPF Record from this zone?" This text input what kind of data expects? A Yes/No Answer ? :(

In the CNAME configuration, if for example I have a site www.mysite.com with codomain mysite.com, then is this valid?
Hostname = something
tarjet = www.mysite.com
Because this lets me to the "shared ip" page when using something.mysite.com in the url.

[falko]

In the SPF configuration for a domain:
I Dont understand this -> "Are emails sent from all servers of this domain?" It doesn't make sense to me :)This makes sense if you have multiple servers for one domain.
Also -> "Inherit SPF Record from this zone?" This text input what kind of data expects? A Yes/No Answer ? :(You can follow this wizard: http://old.openspf.org/wizard.html
The ISPConfig form is structured the same way.

In the CNAME configuration, if for example I have a site www.mysite.com with codomain mysite.com, then is this valid?
Hostname = something
tarjet = www.mysite.com
Because this lets me to the "shared ip" page when using something.mysite.com in the url.
Does www.mysite.com point to the right IP address?