John,
-----Ursprüngliche Nachricht----- Von: John R. Levine [mailto:johnl@iecc.com] Gesendet: Samstag, 5. Dezember 2009 01:54 An: Andre Engel Cc: nanog@nanog.org Betreff: Re: AW: SPF Configurations
Right. The only major mail system that pays attention to SPF is Hotmail, but there are enough small poorly run MTAs that use it that an SPF record which lists your outbounds and ~all (not -all) can be marginally useful to avoid bogus rejections of your mail.
For example : [ various large ISPs that publish SPF ]
Perhaps this is a language problem. In English, "publishes" is not a synonym for "pays attention to." As I said, you need to publish SPF to get mail into Hotmail. That's why people do it.
As I said im almost german :-) Some major providers ,1&1 for example, assigned their customers the "responsibility" to "pay attention on SPF" for getting mails into their boxes.(decision between suspicious or not)
I know there is a problem so far with forwarded emails but there is also a solution : [ hoary SRS proposal to change every SMTP server in the world to make them match what SPF does ]
Sigh.
I do not want to change every SMTP servers in the world. I just gonna show an useful option .-)
Every time a mail arrives that is an SRS address the password and timestamp could be checked, and faked or outdated recipients could be rejected.
You might want to look at BATV, which has nothing to do with SPF, but I have found is quite useful for recognizing spam blowback.
Sure ! For instance If your are providing an mail cluster for your customer bills, a newsletter server or a cooperated mail cluster and you know that you are sending emails only to receivers email boxes BATV is indeed a awesome tool. But if you are performing a shared mail cluster for your webhosting or your Dial in customers which are using for instance some special kinds of mailing lists maybe you need a additional solution.
From a reputation perspective Id like the idea to combine a set of anti spam tools if it is useful. Indeed MAAWG is not "the badest place" to learn about.
R's, John
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Sure! Im here to learn *** .-) Cheers Andre -- Andre Engel Consulting Program Director, Email and Cyber Intelligence Services "..no space left on the device/Kein Weltraum links auf dem Gerät" FHE3 GmbH P: +49 721 869 5907 Scheffelstr. 17a M: +49 160 962 44476 76135 Karlsruhe andre.engel@fhe3.com http://www.fhe3.com/ Amtsgericht Mannheim, HRB 702495 Umsatzsteuer-Ident: DE254677931 Geschäftsführer: Peter Eisenhauer, Michael Feger, Dimitrij Hilt *** This email is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE ,...