[RFCI-Discuss] Yahoo break RFC

[jeff_pang at arcor.de]

 Thanks for replying derek.
What I'm not satisfied with yahoo is, they don't follow the SPF rules.
Then we have to adjust our SPF antipsam policy, if we follow Yahoo, we must give up all SPF checking.
This is what we don't like to see.


----- Original Nachricht ----
Von:     "Derek J. Balling" <dredd at megacity.org>
An:      Discussion about the RFC-Ignorant Project <rfci-discuss at lists.megacity.org>
Datum:   29.10.2007 19:01
Betreff: Re: [RFCI-Discuss] Yahoo break RFC

> Speaking strictly to RFCs, not to "policies", "sanity" or "right- 
> ness"....
> 
> > Ok I sent this message with Arcor email, but this was not the real  
> > Arcor, it's from Yahoo's mail server.
> >
> > The thing let me upset is, Yahoo fake the envelope address.
> 
> They have not "faked it", they have set it to what the sender (you)  
> have said it should be.
> 
> > You can see,Yahoo doesn't have the privileges to declare it's  
> > gmail,but it did.
> 
> The SMTP RFCs say nothing about "what servers have privileges to use  
> what domain-parts in the envelope".
> 
> > Another problem,with faking envelope address, Yahoo has broken the  
> > SPF rules.
> 
> And a site using SPF will reject that e-mail.
> 
> > When a server get a message from abc at arcor.de which was faked by  
> > Yahoo, the sending IP doesn't belong to
> > Arcor, how would the recipient server think about? It reject this  
> > message or not?
> 
> If the site uses SPF, yes, they would/should reject it, assuming  
> that's the SPF policy you publish.
> 
> > How about your thought on it? Is this a RFC break? Thanks!
> 
> I don't see any "breaking of RFC" here. It may not be how I would have  
> done it, but I can understand the logic behind the decision.
> 
> Cheers,
> D
> 
> 
> 
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