FYI, our university-based listserver somehow made it on a list of spamservers recently. Many ISP's then simply refused any of our mail. The error message reads as follows: Final-Recipient: RFC822; <medphys subscriber's email address removed> Action: failed Status: 5.1.3 Remote-MTA: DNS; nymx01.<domain> Diagnostic-Code: SMTP; 553 5.3.0 Mail from 141.217.1.57 rejected;see http://mail-abuse.org/cgi-bin/nph-rss? 141.217.1.57 Last-Attempt-Date: Thu, 8 Mar 2001 18:45:41 -0500 (EST) If you know your server's IP address, you can check the website mentioned to see if this is why you may be having delivery problems.