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RE: dynamic DNS and SPF?

2004-06-03 17:12:53
Why not use "v=spfv1 a:lotas-smartman.net ?ip4:81.98.88.0/21 -all"?

This would make any mail from your IP an SPF pass, any mail from NTL's Dublin 
pool "neutral" (same as having no SPF record) and any mail from elsewhere a 
"fail". The IP range should only come into play in the 5 minutes or so after 
your IP addresses changes, as that is the TTL of the DNS A record for 
lotas-smartman.net.

The "neutral" result is not a long-term solution. Sure it works fine now (when 
no one is rejecting neutrals), but (in the future) everyone will set their MTAs 
to reject everything except "pass".

Michael R. Brumm


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