The proper values are 0 for off and 1 for on.
Actually, I think I got those numbers reversed, as I have "0" in my persomal user_prefs file.
Of course, if I'm wrong, and 2 is a valid option, please feel free to ignore me.
Excerpt from http://www.spamassassin.org/doc/Mail_SpamAssassin_Conf.html#item_report_safe_%7B_0_%7C_1_%7C_2_%7D_%28default%3A_1%
report_safe { 0 | 1 | 2 } (default: 1)If this option is set to 1, if an incoming message is tagged as spam, instead of modifying the original message, SpamAssassin will create a new report message and attach the original message as a message/rfc822 MIME part (ensuring the original message is completely preserved, not easily opened, and easier to recover).
If this option is set to 2, then original messages will be attached with a content type of text/plain instead of message/rfc822. This setting may be required for safety reasons on certain broken mail clients that automatically load attachments without any action by the user. This setting may also make it somewhat more difficult to extract or view the original message.
If this option is set to 0, incoming spam is only modified by adding some X-Spam- headers and no changes will be made to the body. In addition, a header named X-Spam-Report will be added to spam. You can use the remove_header option to remove that header after setting report_safe to 0.
