It hasn't risen to the level of DDOS, yet, but I'm getting many hundreds of these messages per night (and it is now continuing during the day).

They look like this:


Hi. This is the qmail-send program at
I tried to deliver a bounce message to this address, but the bounce bounced!

<>: does not like recipient.
Remote host said: 550 5.1.1<>: Recipient address rejected:
Giving up on

--- Below this line is the original bounce.


... each one with totally unrelated email and IP addresses and with variable 
sizes and all in MIME format.

I use FreeBSD here.  Running qmail in a jail.  I do use ssmtp running on the 
host (not jailed) in order to get the periodic daily/weekly/monthly reports.

Is someone somehow using my system to try to send spam?

Any idea how to block this?

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