nanog mailing list archives

Re: SPF Configurations


From: James Bensley <jwbensley () gmail com>
Date: Fri, 4 Dec 2009 17:03:08 +0000

2009/12/4 Bret Clark <bclark () spectraaccess com>

If the customer insist on using their domain, then you would have to have
the customer setup an SPF record within their domain that points to your
email server IP blocks. I would just tell your customer that if they insist
of using their FROM domain, to help get past someone's spamming system the
customer is going to have to add the a SPF record to their domain similar to
the following:

[customer domain].com. IN TXT "v=spf1 a mx ip4:[your IP block]

Putting an SPF record in your DNS record will have no affect on spamming
software. SPF is basically another form of reverse DNS at the mail level.

Bret


The problem we face is that some people we work with can't do that, they
can't even grasp what an SPF record is and so as far as our own spam
filtering goes, we have filtered their emails to us sent with the FROM
address being an @mysurname.com domain which doesn't exist and as a result
we have filtered out their mails so we have had to lower our SPF checking
slightly which is so annoying :S

-- 
Regards,
James ;)

Charles de Gaulle<http://www.brainyquote.com/quotes/authors/c/charles_de_gaulle.html>
- "The better I get to know men, the more I find myself loving dogs."


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