Mixing SPF records

Question

I have the usual Google Apps SPF record in my DNS:

v=spf1 include:_spf.google.com ~all

and now, since we are using ZenDesk, I should also add:

v=spf1 include:support.zendesk.com ~all

Should they be merged into one like this:

v=spf1 include:_spf.google.com include:support.zendesk.com ~all

Answer 1

Yes, that is correct, unless _spf.google.com includes a redirect (which it doesn't). In that case, include:_spf.google.com should be moved to end of the list to avoid replacing all entries after the include with the redirect

Answer 2

Yes, that will work. It's also the proper way to do it.