SPF question

[Madison Kelly]

Hey all,

   So I ran into a problem with my Sender Policy Framework DNS entry. My 
message was rejected because of my SPF entry in my DNS zone file because 
I used my ISP's SMTP server.

   My question is, how do you setup an SPF entry when email users of 
your domain are literally all over the world? It's impractical to 
impossible to create a list of all the different MTAs my users may use, 
and given that many ISPs now block port 110 to any server other than 
their own SMTP server(s), asking non-techy users to use non-standard 
ports when setting up their email program is also not feasible.

   In case it helps, this is my SPF for my alteeve.com domain:

alteeve.com. in txt "v=spf1 ip4:192.139.81.0/8 a mx mx:alteeve.com -all"

   Is there an alternate to SPF I should look at?

Thanks all!

Madi
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