nanog mailing list archives
Re: SPF Configurations
From: Suresh Ramasubramanian <ops.lists () gmail com>
Date: Tue, 8 Dec 2009 01:25:01 +0530
On Mon, Dec 7, 2009 at 11:21 PM, Michael Holstein <michael.holstein () csuohio edu> wrote:
Personally, I think SPF is a major PITA operations-wise .. but if you've ever had to fill out the form to get un-blacklisted at Yahoo/AOL, that's one of the first things they ask .. "do you have a spfv1 record defined?".
With yahoo and aol - they'd be just as satisfied if you used, say, DKIM. Hotmail's the only one that insists on sender-id (not spfv1 either) As for a university smarthost getting blocked you'd probably need to look at one of two things - 1. Forwarding users on your campus - with mailboxes that accept a lot of spam and then forward it over to student / alumni AOL, Comcast, Yahoo etc accounts 2. Spam generated by infected PCs / laptops, hacked machines etc on your campus LAN If you took steps to fix some of these - 1. Isolate your forwarding through a separate IP or subnet, filter it before forwarding on 2. Separate your outbound to another set of IPs, again filter and a few other things - related to this .. you'd get blocked far less. Joe St.Sauver of UOregon, being a maawg senior tech advisor and also active in EDUCAUSE etc, might have a white paper on this, like he does on most other security related issues under the sun :) -- Suresh Ramasubramanian (ops.lists () gmail com)
Current thread:
- AW: SPF Configurations, (continued)
- AW: SPF Configurations Andre Engel (Dec 04)
- Re: AW: SPF Configurations John R. Levine (Dec 04)
- AW: AW: SPF Configurations Andre Engel (Dec 05)
- Re: SPF Configurations Lars Eggert (Dec 04)
- Re: SPF Configurations Sean Donelan (Dec 06)
- Re: SPF Configurations Bill Stewart (Dec 06)
- Re: SPF Configurations Sean Donelan (Dec 07)
- Re: Official Mail, was SPF Configurations John Levine (Dec 07)
- Re: SPF Configurations Michael Holstein (Dec 07)
- Re: SPF Configurations Douglas Otis (Dec 07)
- Re: SPF Configurations Suresh Ramasubramanian (Dec 07)
- Re: SPF Configurations Tony Finch (Dec 08)
- Re: SPF Configurations Suresh Ramasubramanian (Dec 08)
- Re: SPF Configurations Michael Holstein (Dec 08)
- Re: SPF Configurations Tony Finch (Dec 08)
- RE: SPF Configurations Jeffrey Negro (Dec 04)