On 10/21/2005 06:42 am, Sandipan Chowdhury wrote:
I am planning to impliment SPF in my network. But before that I want to
know how popular is SPF. How many cos have adopted SPF so far in US. I
fear that after implimenting SPF my server might end up refusing emails
from many of my clients if they havn't publishe SPF record.
Also, it would be very helpful if anyone can tell me the best DNS
service provider for this purpose.
Thanks
Sandipan
I can't tell you the best DNS provider, but here is a list of providers I know
of (less a couple of updates that have been sent to me, but I haven't had
time to do yet):
http://www.kitterman.com/spf/txt.html
All SPF implementations I know of have the ability to tune their response to
different SPF results. You should definitely NOT reject mail from domains
that do not have an SPF record. SPF records are fairly widely published, but
no where near universal.
You ought to initially set your SPF checker to calculate SPF results, but not
reject on any result. You can then inspect logs, use it for an input to spam
filtering, etc. while you evaluate it's effectiveness.
Different people use e-mail differently. For some userbases you will be able
to reject based on SPF failure with little/no problem. For others, that can
be problematic and the most you can do at this point is use it as a element
of spam filtering. The only way to know is to test.
Scott K
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