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1. The listserv uses an automated system to suspend subscriptions if it is unable to deliver your email to you. If your mailbox is full and your Parkinsn email bounces for a 4 day period you will be suspended. 2. The listserv hosts scores of email list like Parkinsn with thousands of people joining and signing off. 3. Not all lists, like Parkinsn, require an acknowledgement. Email spammers use automated software to bogusly subscribe to every list with the hope their ads will penetrate the listserv defenses. Of course the attempted spammers use forged return addresses and error messages go to the forged address. A number of your ISPs use a service called SpamCop which intercepts email coming from known spam addresses. They detect spam by setting up dummy email addresses. Spammers sometimes use this forged address to subscribe. Normal messages to any of these addresses is detected as spam and that sending IP is blocked. Barbara Patterson has been unsubscribed many times because of SpamCop. I will show you the list of members who have been unsubscribed because of SpamCop having the listserv at the University of Toronto on the block list. Here is the recent list of a few: The following 9 subscribers were deleted from the PARKINSN list today: Barbara Patterson <[log in to unmask]> Last error was: smtp; 554 (Service unavailable; Client host [128.100.132.38] blocked using bl.spamcop.net; Blocked - see http://www.spamcop.net/bl.shtml?128.100.132.38) Helen Scott <[log in to unmask]> Last error was: smtp; 554 (Service unavailable; Client host [128.100.132.38] blocked using bl.spamcop.net; Blocked - see http://www.spamcop.net/bl.shtml?128.100.132.38) Joan U <[log in to unmask]> Last error was: smtp; 550 (Blocked - see http://www.spamcop.net/bl.shtml?128.100.132.38) Kenneth Goodrich <[log in to unmask]> Last error was: smtp; 550 (Limit exceeded Found 128.100.132.38 in orbs recent cache, action [deny] [bl.spamcop.net]) "Jefffe [log in to unmask]" <[log in to unmask]> Last error was: smtp; 554 (Service unavailable; Client host [128.100.132.38] blocked using bl.spamcop.net; Blocked - see http://www.spamcop.net/bl.shtml?128.100.132.38) Fred Kalbfleisch <[log in to unmask]> Last error was: smtp; 550 (Blocked - see http://www.spamcop.net/bl.shtml?128.100.132.38) Jim Slattery <[log in to unmask]> Last error was: smtp; 554 (Service unavailable; Client host [128.100.132.38] blocked using bl.spamcop.net; Blocked - see http://www.spamcop.net/bl.shtml?128.100.132.38) Joe Gough <[log in to unmask]> Last error was: smtp; 554 (128.100.132.38: on real-time blacklist bl.spamcop.net) "R.David Robertson" <[log in to unmask]> Last error was: smtp; 554 (Service unavailable; Client host [128.100.132.38] blocked using bl.spamcop.net; Blocked - see http://www.spamcop.net/bl.shtml?128.100.132.38) 4. If your Parkinsn email stops it is probably because your ISP uses SpamCop to keep spam out of your mailbox. Appealing to your ISP will probably not be fruitful. When I detect SpamCop is blocking subscriber email our liaison at UToronto appeals to SpamCop to remove the listserv from the black list. Things will be hunky dory for a few days until a new wave of fraudulent subscribers is generated by the spammers. Then we go back on the SpamCop list because of the error messages the listserv sends to the fraudulent subscribers. 5. The sure way to keep your Parkinsn messages coming is get a hotmail or similar mailbox for your Parkinsn email. If you have had your subscription, getting an email address other than your ISP is the way to go. Check the mailing list webpage to verify that you have received all messages or to see if you posting has been distributed. Remember postings are not distributed until the following morning after midnight. http://parkinsons-information-exchange-network-online.com/maillist.html John Cottingham co-owner Parkinsn -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.408 / Virus Database: 268.13.4/477 - Release Date: 10/16/2006 ---------------------------------------------------------------------- To sign-off Parkinsn send a message to: mailto:[log in to unmask] In the body of the message put: signoff parkinsn