Pidgin-privacy-please – A privacy plugin for the pidgin instant messenger
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It offers the following features:
Block individual users
Auto-reply to blocked messages
Block messages from people who are not on your contact list (with an optional auto-reply)
Block messages using regular expressions, either against the message sender, the message content, or both
Suppress repeated/all authorization requests
Suppress OSCAR (ICQ/AIM) authorization requests
Automatically show user info on authorization requests
Block jabber headline messages (eg. alerts from the MSN transport)
Block AOL system messages
Challenge-response bot-check
Auto-reply on blocked messages
You can have an auto-reply message sent to people whose messages have been blocked to prevent accidentally blocked messages from disappearing unnoticed.
Messages from unknown people
You can block any messages from people who are not on your contact list and optionally have an auto-reply sent, telling them to request your authorization first. Just check the corresponding options in the configuration dialog.
Authorization requests
For protocols where the user name does not tell you anything about the actual person behind it (eg. ICQ) there is also an option to have the user information pop-up automatically shown whenever somebody asks for your authorization.
Or, if you already have all the friends you need, you can also have all authorization requests rejected automatically (note that, depending on the protocol, you might still be asked for a reason for rejecting).
Bot check
To block spam-bots, you can have pidgin-privacy-please ask a simple question whenever somebody starts a conversation. If they send the right answer, they will be allowed to talk to you. Note that the right answer may be surrounded by other text, so if the right answer is "foo", and they write "i guess it's foo or bar" that's fine, so don't make the answer too short (eg. a simple character like ‘a' is a bad choice).
Install Pidgin-privacy-please on ubuntu
open the terminal and run the following command
sudo apt-get install pidgin-privacy-please