newbie: spf record and including smtp web forms

Hi,

I just want to check if I have done this right - what i was about to
publish is this:

"v=spf1 mx ptr include:cmail1.com include:aspmx.googlemail.com ~all"

What I was wondering about is - as I use google apps to process my
emails but have an online web form which uses the web hosting smtp -
do I add this as an a record:

"v=spf1 a:smtpmail.active24.com mx ptr include:cmail1.com
include:aspmx.googlemail.com ~all"

The web form only comes straight to our inbox and from the same domain name.

Thanks,
Tania

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