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Sender Policy Framework - SPF any use as a future Spamfilter feature?

Printed From: LogSat Software
Category: Spam Filter ISP
Forum Name: Spam Filter ISP Support
Forum Description: General support for Spam Filter ISP
URL: https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3356
Printed Date: 01 November 2025 at 5:44pm


Topic: Sender Policy Framework - SPF any use as a future Spamfilter feature?
Posted By: Guests
Subject: Sender Policy Framework - SPF any use as a future Spamfilter feature?
Date Posted: 30 March 2004 at 6:47am

I've read a few articles on this SPF idea...

http://spf.pobox.com" CLASS="ASPForums" TITLE="WARNING: URL created by poster. - http://spf.pobox.com" CLASS="ASPForums" TITLE="WARNING: URL created by poster. - http://spf.pobox.com

does seem to make sense, especially if AOL are starting to use it and some academic sites.

at its simplest level, you put a record in your DNS for external sites to check against.

this then defines either your IP real address range (to stop spam/ faked virus emails etc) or you explicitly define the servers that you send mail from.

this is all makes a lot of sense to me.

it doesn't have a "critical mass" yet, enough people to make it meaningful, but in the next few months with new releases of software.

comments?

 


Replies:
Posted By: LogSat
Date Posted: 31 March 2004 at 9:56pm

I've added it to the wishlist, it's not hard to implement, we may be able to include it in SpamFilter in a few weeks. Good suggestion, thanks!

Roberto F.
LogSat Software

Posted By: Guests
Date Posted: 01 April 2004 at 10:55am

thanks Roberto.

even if your own site doesn't use it, I can see the advantages in catching spoofed emails and viruses if others do (especially AOL).

if you run up nslookup, set type=txt, and lookup lboro.ac.uk you will see an example.

something like

"v=spf1 ip4=158.125.0.0/16 ip4=131.231.0.0/16 ip4=194.66.220.0/24 ip4=21
3.106.251.0/26 ip4=213.106.253.0/26 ?all"

so you know exactly what their valid subnets are, anything else can be ditched.

the subnet idea is good, you can even be specific to your 3-4 servers that send outgoing mail which is probably even better.


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