Hugo, Michael, and Frank all pointed into the direction of exim4. This was correct. Being conservative, I had always resisted upgrading from exim3 to exim4 (because exim4's configuration is more difficult). The latest sid upgrade apparently became annoyed at this and removed exim3, declaring it "obsolete" -- but without replacing it by anything else.. so I had no mta.
Why Sid suddenly has become so intolerant of exim3 I don't know. I could continue to use e-mail (but not reportbug) because my configuration is: vega -> procyon -> internet procyon is my Sarge "home server" (still running exim3). vega is my "normal" computer. An mta on vega is only necessary for programs like reportbug and mail (i.e. "mail", the classic program). Other programs (mua's like icedove) already know that procyon is the outgoing smtp server. Maybe I can teach this fact to reportbug and mail also (how?). If so, I won't need an mta on vega. Anyway dpkg -l grep exim on vega revealed that exim3 had been removed. So crossing my fingers I installed exim4 on vega and told it that procyon was the smarthost. It worked. Thanks to all who responded! Regards, Jan -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]