I've forgotten three things:

1. The files were copied out of an Exim system. It is now on a FreeBSD 4.9 stable system running qmail 1.03 (as per LWQ) and courier-imap 2.2.1.

2. There was no mailspool file. The original was empty, so I didn't copy it.

3. The dirlist of oldmail: rvnl0001@usnj1 ~ $ ll -R oldmail/ total 11904 drwxr-x--- 2 rvnl0001 rvnl0001 - 512 May 13 23:46 ./ drwxr-xr-x 6 rvnl0001 rvnl0001 - 512 May 13 23:46 ../ -rw-r----- 1 rvnl0001 rvnl0001 - 80 May 12 23:00 .mailboxlist -rw-r----- 1 rvnl0001 rvnl0001 - 193406 Apr 21 17:01 Trash -rw-r----- 1 rvnl0001 rvnl0001 - 23067 Apr 15 23:47 accountant -rw-r----- 1 rvnl0001 rvnl0001 - 3236478 May 11 20:22 aplus -rw-r----- 1 rvnl0001 rvnl0001 - 75543 May 12 23:18 dance -rw------- 1 rvnl0001 rvnl0001 - 486359 May 12 23:00 diversen -rw-r----- 1 rvnl0001 rvnl0001 - 15133 May 12 23:18 inbox -rw-r----- 1 rvnl0001 rvnl0001 - 35465 Apr 15 23:50 leveranciers -rw-r----- 1 rvnl0001 rvnl0001 - 3139 Apr 2 23:11 postmaster -rw-r----- 1 rvnl0001 rvnl0001 - 8036313 May 12 23:03 renvos producties -rw-r----- 1 rvnl0001 rvnl0001 - 1535 Apr 21 17:19 sent-mail rvnl0001@usnj1 ~ $ cat oldmail/.mailboxlist Trash postmaster renvos producties leveranciers aplus accountant dance diversen