Distributed mailbombing on one address

4 msg	Rewriting To: field for outbound messages
13 msg	My server send e-mails that are considered SPAM
6 msg	Web Based Front End - Update
2 msg	mailman subdomain not recognized by some mail s...
14 msg	Trying to feed an script with an email
5 msg	Q: smtpd_recipient_restrictions w/reject_unlist...
2 msg	Question about recipient canonical rewrite and ...
3 msg	QQ regarding server performance impact when doi...
1 msg	Re: qshape and greylisting
4 msg	Address Verification Question

Distributed mailbombing on one address
\ Frank Bonnet (28 Mar 2008)
. \ Terry Carmen (28 Mar 2008)
. . \ Terry Carmen (28 Mar 2008)
. \ Jorey Bump (28 Mar 2008)
. . \ Frank Bonnet (28 Mar 2008)
. . . \ mouss (28 Mar 2008)
. . . . \ Kelvin Smith (28 Mar 2008)
. \ (Wietse Venema) (28 Mar 2008)

2 msg	Trouble with postmaster alias
5 msg	Parent domains confusion?
2 msg	Anti-virus scanning with Postfix & Mac OS X
2 msg	Folder Structure help
8 msg	qmgr_active_corrupt
3 msg	retiring a mail server
2 msg	SMTP verification
9 msg	Multiple IPs
2 msg	Controlling out going messages

Subject:	Distributed mailbombing on one address
Group:	Postfix-users
From:	Frank Bonnet
Date:	28 Mar 2008

Hello

The mailbox of a user here is literally mailbombed ( ~ 4 mails / seconds )
I have checked into email syslog and it appears the attack seems distrinuted
and comes from dozens of randoms servers ...

I have setup a new account for the user but the attack still continues.

For now I have aliased the attacked address to /dev/null but I wonder
what would be the most efficient (which generate the smalest load of the server)
method to refuse/discard emails for this address ?

Thanks a lot