[Exim] STOP - mail from <> emails

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Author: Schalk Erasmus
Date:  
To: exim-users
Subject: [Exim] STOP - mail from <> emails
Hi,

I keep on having tons of mails in my Exim Queue, and most of them is SPAM
like this one:

************************************
Server# exim -q -v
************************************

LOG: queue_run MAIN
Start queue run: pid=22363
Connecting to mail.newfunpages.com [64.23.81.68]:25 ... connected
SMTP<< 220 fun2send.com ESMTP Sendmail 8.11.6/8.11.6; Mon, 7 Jul 2003
02:06:54 -0400
SMTP>> EHLO Server

  SMTP<< 250-fun2send.com Hello Server, pleased to meet you
         250-ENHANCEDSTATUSCODES
         250-8BITMIME
         250-SIZE
         250-DSN
         250-ONEX
         250-ETRN
         250-XUSR
         250 HELP

SMTP>> MAIL FROM:<> SIZE=4292


************************************
Notice the Mail From command = <>
************************************

My question is, how can I block <> senders and recipients with Exim, or do I
need a Spam filter?

Also, how are Spammers able to relay through my server? Since I only allow
relaying for certain IP's and domains. Or are they intelligent enough to
relay mails using the same host name (server name)?

Hope someone could be of assistance.

Regards
Schalk