which is the better spf record format?

[oROEchimaru]

we recently discovered an spf error on some of our emails. we have spf records (txt file type)... but they are a little out of date. we used microsoft's website to generate new ones, but are they valid? (I made up the ip's and domain name)

Microsoft's reccomendation:
v=spf1 a mx ptr ip4:207.250.223.50 mx:etp.cleanhound.com -all

ours:
v=spf1 mx ptr ip4:207.250.223.0/32 -all


notes: ours has .0/32 rather than the exact ip like .15 ... is a range (our version) needed for domains that have users from around the country... with external IPs?

ETP: is the name of our mail server... so all of our mail domains reference this server.

 

[Wolf-R1]

Not sure about the rest of it but the first thing that pops up is that your IP/subnet mask combination is invalid.

 

[oROEchimaru]

did you perform a test? if so where... thats because i posted a fake site... theres no harm posting the real info since you can get it with a whois from anywhere i'll post it here:
(if you noted something specifically wrong please point it out thank you for your help!)

v=spf1 a mx ptr ip4:207.250.223.50 mx:etp.cleanhound.com -all

ours:
v=spf1 mx ptr ip4:207.250.223.0/32 -all