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Re: [spf-discuss] the wizard and frequently seen problems

2006-05-19 13:41:42
Alex,

Nice job.  Here are some suggestions.

From http://www.vandenbogaerdt.nl/spf/wizard-help.html
... do a lookup on your MX server, then lookup the resulting A record(s), then find the associated IP address(es). If you already know the IP addresses and if these don't change often, it's better to put those addresses in your record;

Minor clarifications: ...then lookup the resulting A record(s) to find the associated IP address(es).
... better to put those addresses directly in your SPF record;

...
Always consider what a receiver needs to do if that receiver uses the record that you created. Do so for email really sent by you but also consider cases where a virus or a spammer abuses your name.

Add another paragraph:
Keep your SPF record simple. A list of "ip4" terms is all you really need. "a" and "mx" terms may save you some effort updating your SPF record when your "a" or "mx" addresses change, but this savings should be weighed against the cost of multiple DNS queries on every message, especially spam messages, which typically exercise every term in your record.

-- Dave


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