On Sat, 27 Aug 2005 18:21, Roberto Della Pasqua wrote: > Let me tell you that the spam problem of the SMTP is due to the fact that > everybody can send emails without authenticate in any server, just found a > relay server and use it.
This isn't the only way to send it. Spammers often have their own mail
servers. Clients can always connect directly to the receiving server too.
Jabber solves the issue of clients spamming directly to servers, but not the
problem of spammers having their own valid domains. However, things such as
dialback do in fact slow down the spammers and make their activities cost
more, which is good.
> What is the default behavior of XMPP now sending IM message to a not-listed
> in buddy-list?
It's an expected use case where the message should be delivered as per usual.
Some clients offer the ability to drop messages from users not on the contact
list, but in general it's good to be able to receive messages from new users.
Spam might, of course, come from people who managed to get on the contact
list. Also, as someone else pointed out, the request to get on the contact
list can itself be a spam.
TX
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