ウソばっかし。新しい server machine に /etc/c-client.cf を copy し忘れてて, black-box が効いてなかっただけ。おバカちゃん。
[~]$ telnet localhost imap yoshino (pts/14) Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. * OK localhost IMAP4rev1 2000.279 at Fri, 8 Sep 2000 20:57:16 +0900 (JST) yoshino LOGIN tsumura ほげほげ yoshino OK LOGIN completed yoshino SELECT #mh/inbox * NO /home/lab3/tsumura/.mh_profile not found, mh format names disabled yoshino NO SELECT failed: Can't open mailbox #mh/inbox: no such mailbox
そら見えんわ。ついでに imap-2000 にしてみた。