Are there any Linux client with good spam filtering? I had to give up on XMPP as I was receiving thousands of times the amount of spam as I did actual messages. Just rendered the whole thing completely unusable.
I think you can block a user easily if your server supports XEP-0191, or if it implements some sort of blacklisting. I am unsure about blocking client side, since I never needed it (yet?).
It is probably due to XMPP's lack of popularity, but FWIW I have been using my XMPP for about 4 years and have not received a single unsolicited message yet.
