[Exim] Under attack: discarding mail.

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Author: Leonardo Boselli
Date:  
To: exim-users
Subject: [Exim] Under attack: discarding mail.
Now some "@@@@@"fellow is spamming to some [invalid]
address giving as sender random usernames in one of my hosts.
This led to this annoying effect, that is a lot of frozen message ....
Any idea on avoiding this ?
(i do not think just accepting and forwarding to bit_bucket ANY
message sent to unknown locar user is a good idea, since it could
give the appearence that the users are really here !)
:
2001-02-06 22:39:02 14QFpC-0007GT-00 <= <>
H=(imagic.com.tw) [210.243.145.146
ot P=esmtp S=7641 id=200102071048.FAA31485@???

2001-02-06 22:39:02 14QFpC-0007GT-00 **
ihmorrison93580@???
nown local-part "ihmorrison93580" in domain "freedom.dicea.unifi.it"

2001-02-06 22:39:02 14QFpG-0007Gd-00 <= <> R=14QFpC-
0007GT-00 U=mail P=local

2001-02-06 22:39:02 14QFpC-0007GT-00 Frozen (delivery error
message)

2001-02-06 22:39:02 14QFpG-0007Gd-00 => leo
<postmaster@???
localuser T=local_delivery

Leonardo Boselli
nucleo informatico e telematico
Dipartimento Ingegneria Civile
Universita` di Firenze
V. S. Marta 3 - I-50139 Firenze
tel +39()0554796431 fax +39()055495333
http://www.dicea.unifi.it/~leo