My exchange server name is exchange2013.mydomain.com and my internal and external urls are mail.mydomain.com. I need to create an SPF record at the ISP. How should be my SPF record at ISP be, please do guide me in creating the record. which of the below syntax is rite and whts the difference

v=spf1 a mx ptr mx:mail.mydomain.com all ( I wud prefer to go with this and correct me with the syntax)

or

v=spf1 include:spf.protection.outlook.com -all

or

v=spf1 ip4:publicip include:spf.protection.outlook.com -all

• Edited by Risingflight Thursday, June 11, 2015 4:06 PM r

Thanks alot i have created using the website http://spfwizard.net/ and i have a small confusion.

v=spf1 a mx ptr mx:mail.mydomain.com ?all

Here should it be mx:mydomain.com or mx:mail.mydomain.com 

v=spf1 a mx ptr mx:mail.mydomain.com ?all