Tried to read up on SPF record creating but I am a bit lost. 

I need to combine and create an SPF record because our email is not getting through. 

Here are the ways we send email:

1. Daily newsletter emails are currently sent using Constant Contact. 
So we need to show that they are authorized to send on our behalf. Here is their support article (note, we do not self authenticate) <http://support2.constantcontact.com/articles/FAQ/1768>
2. Transactional emails are all sent using Mandril.
<http://help.mandrill.com/entries/22030056-How-do-I-add-DNS-records-for-my-sending-domains->
3. We use Google apps to send our own emails to customers and our sales team, etc.
4. My domain is registered with GoDaddy and this is where I will be uploading the record.

Can you help me organize SPF and SenderID?