spf-discuss
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RE: SPF and viruses

2004-01-30 06:46:06

So if the DNS admin puts in a wildcard record for *.example.com:

  *               IN      TXT     "v=spf1 -all"

Now spf tests for mail froms of "user(_at_)support(_dot_)example(_dot_)com" 
will return
FAIL.

Unfortunately "host support.example.com" no longer return NXDOMAIN
errors.  Shades of verisign sitefinder here. :-(

In any event, having to make my nonexistent subdomains no 
longer return
NXDOMAIN results on dns queries in order for spf queries to fail for
them seems...strange.

Should the spec specify that spf tests MUST return FAIL on domains
without an associated a or mx (or spf (?)) records?

Use a synthetic DNS record. Problem solved.

Checking for domain existence is a dozy anti-spam check anyway.

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