Some of you may have been having trouble recently sending mail, because of a  recent configuration change.  Because of the need to block spammers from  relaying through our site (If this is not done many sites will refuse any  email from us), I had turned off external mail connections on the clients, since all  incoming mail is routed to the server.    However, certain mail programs, notably dtmail and netscape, use this external  mechanism to connect to the local sendmail daemon to send mail out, so these  programs were unable send mail.  Fortunately, they can be configured to connect  directly to control.    For dtmail, Select the "Options/Advanced..." menu, then in the space marked:  "Host to send mail from:" enter  control.csl.uiuc.edu  This will add the line:  set smtpmailserver='control.csl.uiuc.edu'  to your .mailrc so that this will work next time also.    For netscape (if you ever want to be able to click on one of those email links  in a web page and make it work, follow these instructions):  Select Edit:Preferences, then expand Mail & Newsgroups, the choose Mail  Servers.  For "Outgoing mail (SMTP) server" enter control.csl.uiuc.edu.    Let me know if there are any continuing problems, and thank you for your  patience.