R: R: R: [jdev] about spim techniques

[Peter Saint-Andre]

Ian Paterson wrote:
>>(I should be able to specify the error  message that's
>>returned to you when your message to me is blocked 
>>because you're not in my roster -- at this point we have 
>>something like a challenge-response system
> 
> 
> Yes. IMHO this will be one of the most important anti-SPIM techniques
> (along with the others discussed earlier - regarding registration, s2s,
> etc...).

Hmm, well, I looked at RFC 3921 and it says:

    If a blocked entity attempts to send message or presence stanzas
    to the user, the user's server SHOULD silently drop the stanza
    and MUST NOT return an error to the sending entity.

That seems counter-productive. There might be different reasons to block 
communications, some more personal than others -- I might block the 
message because I don't like you as an individual (in which case I might 
not want you to receive an error, I'm just blowing you off) or I might 
block the message because the sender isn't yet in my roster and in 
general I block all such messages. So I think we might want to adjust 
that in rfc3921bis.

Peter

-- 
Peter Saint-Andre
Jabber Software Foundation
http://www.jabber.org/people/stpeter.shtml