Hello,
I have installed SPF (both SPF checking and publishing an SPF record on
my DNS) at home on my small domain and network at home and things are
working fine so far. It does not block a lot of messages yet, but this
is mostly due to the fact that most of the spam I receive are from
domains that do not publish a SPF record.
But, sometimes, I receive spam that comes from non-existing domain, such
as the one below.
Jun 18 12:17:36 192.168.1.253 postfix/policy-spf[25174]: : SPF unknown:
smtp_comment=Please see
http://spf.pobox.com/why.html?sender=NBYZRHXAUDP%40RND_FROM_DOMAIN
<http://spf.pobox.com/why.html?sender=NBYZRHXAUDP%40RND_FROM_DOMAIN&ip=2
13.22.17.60&receiver=ns1.lepine-lacroix.info>
&ip=213.22.17.60&receiver=ns1.lepine-lacroix.info: domain of sender
NBYZRHXAUDP@RND_FROM_DOMAIN does not exist,
header_comment=ns1.lepine-lacroix.info: error in processing during
lookup of NBYZRHXAUDP@RND_FROM_DOMAIN
So, my question is: is there a way in SPF checking to actually reject
these messages? In a way, if a domain does not exist, there cannot be a
SPF record for it, and it is almost certain that the sender is not
legitimate! If it cannot be dealt in SPF, how can I set my system to
just reject it! I am using Postfix 2.0.1 on a RedHat 8.0 system. I
have not modified my Postfix settings, with the exception of doing SPF
checking. I understand that this may not be per say an SPF question,
but any help could be useful!
Jean-Michel Lacroix
-------
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I have installed SPF (both SPF checking and publishing an SPF record on
my DNS) at home on my small domain and network at home and things are
working fine so far. It does not block a lot of messages yet, but this
is mostly due to the fact that most of the spam I receive are from
domains that do not publish a SPF record.
But, sometimes, I receive spam that comes from non-existing domain, such
as the one below.
Jun 18 12:17:36 192.168.1.253 postfix/policy-spf[25174]: : SPF unknown:
smtp_comment=Please see
http://spf.pobox.com/why.html?sender=NBYZRHXAUDP%40RND_FROM_DOMAIN
<http://spf.pobox.com/why.html?sender=NBYZRHXAUDP%40RND_FROM_DOMAIN&ip=2
13.22.17.60&receiver=ns1.lepine-lacroix.info>
&ip=213.22.17.60&receiver=ns1.lepine-lacroix.info: domain of sender
NBYZRHXAUDP@RND_FROM_DOMAIN does not exist,
header_comment=ns1.lepine-lacroix.info: error in processing during
lookup of NBYZRHXAUDP@RND_FROM_DOMAIN
So, my question is: is there a way in SPF checking to actually reject
these messages? In a way, if a domain does not exist, there cannot be a
SPF record for it, and it is almost certain that the sender is not
legitimate! If it cannot be dealt in SPF, how can I set my system to
just reject it! I am using Postfix 2.0.1 on a RedHat 8.0 system. I
have not modified my Postfix settings, with the exception of doing SPF
checking. I understand that this may not be per say an SPF question,
but any help could be useful!
Jean-Michel Lacroix
-------
Archives at http://archives.listbox.com/spf-help/current/
Donate! http://spf.pobox.com/donations.html
To unsubscribe, change your address, or temporarily deactivate your subscription,
please go to http://v2.listbox.com/member/?listname=spf-help@v2.listbox.com