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In Siskin Settings, in Notifications, you have a setting to disable notifications from unknown (people not in your roster/contact list). This should remove no. of contact request notifications and spamming chats.
Also, when you open a chat with someone, by tapping on its name in the top bar, you will see contact settings and there you can select "Block" to block this user.
There is a new version (it is currently being tested) that allows blocking of whole domains (in the reaction of incoming chats/subscription requests).
I have a problem with spamming from contact requests
There doesn't seem to be a way to block cold-calling contact requests. My brother is saying he gets push notifications for people wanting to start a chat/add a contact. There does not seem to be a way to block all except contacts on list. I have tried by making a new xmpp account and yes I get notifications and uninvited chat requests. How can I block all notifications/contact requests except contacts I have added?
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