I recently learned about the importance of having an SPF record. I read in this article from Google (https://support.google.com/a/answer/178723?hl=en) that the record should include an IP address. When I read your article about setting it up (https://support.e2ma.net/Account_resources/Account_how-to/Instructions_for_setting_up_Emma_as_an_aut...) there was no mention of including an IP address. Additionally Google says to use ~all while your article says to use -all. Could you please clarify this as I am concerned about setting it up wrong? Thank you.