Hi, 

Apologies if this is obvious.  

Mail is delivered to mail.schemamania.org.  

/etc/postfix/aliases causes some mail to be forwarded to
oak.schemamania.org, which moments ago became an internal imap host,
courtesy of imap-wu.  

Oak was once upon a time my sendmail hub, but nowadays runs no mail,
neither daemon nor via inetd.  

Mail is being delivered to oak in /var/mail/username.  I don't think imapd
looks there; I think it wants to see mail in $HOME/Mail.  

AIUI, mail.local(8) moves mail from the spool to the user's mailbox.  What
I don't understand is whether it's invoked by the MTA or imapd.  

Lastly, am I the only one confused by the manpage mail.local(8)?  There's
no binary by that name on my system.  Obviously, I can't invoke
"mail.local" to incorporate from the spool.  

Thanks,

--jkl