message from " " blocks download of mail

We are using qmail and we keep getting an email that shows up with " " in the From line of the email with no subject. Neither Outlook or Thunderbird will download this message or any other message that comes in after it. I am putting in more spam filters and am thinking about trying to create a script that will check and delete emails from this address. Our webmail filter rules will not delete this either. The only fix right now is to go in and manually delete this file our our clients can keep downloading their messages. Very tedious and annoying! Any ideas?

OS?
QMAIL VERSION?
SPAMASSASSIN INSTALLED? Y/N?

can you give a little more detail to help us troubleshoot your problem.

Have you checked your log files? is there an error that is cycling ?

Need more info to help


Frog

It is a FreeBSD server. It is actually hosted through another company so I don't have full access to the server. I am not sure what qmail version it has. It does not have spamassasin installed. I just put up a dns based list that it is checking against. It doesn't show up as an error from what I can see because it looks fine in webmail, it just won't download from a mail client.

ouch...

That particular spacing character in the from field makes me think it is a spammer, but you indicated that your not using spamassissin, so I don't know.

Is it from the same IP? if so, you could use hosts.deny to block the sender from the system

last suggestion:
Try the forum board at www.qmailrocks.org. They do a lot of troubleshooting for qmail on various linux flavors