This is a message based on information from Thomas Zehetbauer
who is unable to subscribe to this list.
(N.B.: list admin: please try to subscribe him if you can, using
email address <thomasz(_at_)hostmaster(_dot_)org>. The request is confirmed
in RT ticket # 11814)
He included a list of domains that have weird looking SPF policies.
One example is this one:
;; ANSWER SECTION:
2realtors4you.com. 86400 IN TXT "v=spf1 ip4:127.0.0.1/32 all"
;; AUTHORITY SECTION:
2realtors4you.com. 63128 IN NS ns2.expireddomains.register.com.
2realtors4you.com. 63128 IN NS ns1.expireddomains.register.com.
There are more domains, from what I can tell at different registrars,
also having such a weird "+all" policy.
2realtors4you.com
12threc.com
blackjackschool.net
6sidan.com
beautifuldomain.com
aktiwell.info
3a-consulting.com
bangladeshvoice.com
bikerpaint.com
2dreamcatcher.com
blackjackcentre.com
bestwebcompany.com
99tette.com
A guess: a tool used by registrars, written by a misguided person, is
setting these SPF records automatically. The intent seems to be to not
authorize email from these domains, although the effect is quite the
opposite.
If you are this person, or if you know who (s)he is:
1: 172.0.0.1 has no place in public DNS
2: you should use "-all", not just "all". You are currently authorizing
all IP addresses in the entire ip4 and ip6 address space to send mail
on behalf of these domains.
(side note: in hindsight it would make sense to have another default
for "all", but we don't. The default result is "+", just like it is
for any other mechanism.)
Why did Tom report this in the first place? He thinks SPF_PASS is
a reliable indicator of a message not being spam. I tried to convince
him this is not the case, but failed to do so.
If you have anything to say, please do cc. Tom if you reply to the list.
regards
Alex
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