> Could it be a DOS on your SMTP port(s)?
Perhaps an elaboration is in order. If you go:
telnet yoursmtpserver smtp
mail from: <me>
rcpt to: <me>
data
and leave it there without closing the connection or completing
the SMTP transaction, you will have a situation pretty similar to
the one you describe; a qmail-queue process that sits around until
qmail-smtpd times out and a zero length file in mess/* and no files
elsewhere.
I don't necessarily mean a malicious DOS. It may be a lame SMTP client
getting confused at the same point in the transaction and subsequently
getting wedged for some reason.
Regards.
