Hi, My ISP has a spam filter, and if it detects spam, it bounces it with the message: "Remote host said: 550 Blocked by recipient's spam filter options." Here is an extract of a messages from linux-pm-request at lists.osdl.org: <Extract start> Your membership in the mailing list linux-pm has been disabled due to excessive bounces The last bounce received from you was dated 03-Jul-2006. You will not get any more messages from this list until you re-enable your membership. You will receive 3 more reminders like this before your membership in the list is deleted. To re-enable your membership, you can simply respond to this message (leaving the Subject: line intact), or visit the confirmation page at <Extract stop> Is there anything that can be done to stop this auto-unsubscribe? James