SPF record confusion

Tech Tip: Click here to run a free scan for Windows Errors and optimize PC performance

Hello!

I have been reading about SPF records all afternoon. Depending upon which
SPF tool is used to create the record, I have ended with the several
different SPF records noted below. I am running a single SBS 2003 SP1 server
with Exchange SP2, static IP address, PTR set up with ISP, MX and A records.

SPF records via Microsoft SPF Wizard at
http://www.microsoft.com/mscorp/safety/content/technologies/senderid/wizard/

v=spf1 mx ip4:xxx.xxx.xxx.xxx ptr:mail.mydomain.net
mx:mail.mydomain.net -all

v=spf1 mx ptr ip4:xxx.xxx.xxx.xxx mx:mail.mydomain.net -all



SPF records via wizard at https://openspf.org

v=spf1 mx ip4:xxx.xxx.xxx.xxx ptr:mail.mydomain.net
mx:mail.mydomain.net -all

v=spf1 ip4:xxx.xxx.xxx.xxx a mx mx:mail.mydomain.net ~all

v=spf1 ip4:xxx.xxx.xxx.xxx -all




What do I really need to have? It seems as though

v=spf1 ip4:xxx.xxx.xxx.xxx -all

should be all I need. Why are all the other options presented? What do they
all mean?

Thank you for helping an SPF noob.

Gregg Hill


.