SFP record setup for single server

Question

I have a single server

Domain: mycompany.com Server: mail.mycompany.com MX: mail.mycompany.com

Would this record work

"v=spf1 ip4:38.28.xx.yy a:mail.mycompany.com mx:mail.mycompany.com ~all"

Answer 1

Use simple:

"v=spf1 mx -all"

and test it(http://www.kitterman.com/spf/validate.html)