what is this?

[C <claudiu.ionescu () SCALAJWT RO>]

Hi,
Last night my logcheckd come up with the following:

Active System Attack Alerts
=-=-=-=-=-=-=-=-=-=-=-=-=-=
Aug  9 18:27:07 main sendmail[20202]:SAA20194:
to=<ztattack11 () aol com>,<zpb316 () aol com>,<zotzum () aol com>,<zosom0 () aol com>,<zipper032563 () aol 
com>,<zion808 () aol com>,<zigmo123 () aol com>,<ziggy3131 () aol com>,<zi69 () aol com>,<zerogoals () aol com>,
delay=00:00:06, xdelay=00:00:00, mailer=relay, relay=my.isp.ro.
[xxx.xxx.xxx.xxx], stat=Sent (ok
965834789 qp 24507 accepted for delivery to /dev/null. Thank you.)
Aug  9 18:27:07 main sendmail[20202]: SAA20194:
to=<ztattack11 () aol com>,<zpb316 () aol com>,<zotzum () aol com>,<zosom0 () aol com>,<zipper032563 () aol 
com>,<zion808 () aol com>,<zigmo123 () aol com>,<ziggy3131 () aol com>,<zi69 () aol com>,<zerogoals () aol com>,
delay=00:00:06, xdelay=00:00:00, mailer=relay, relay=my.isp.ro.
[xxx.xxx.xxx.xxx], stat=Sent (ok
965834789 qp 24507 accepted for delivery to /dev/null. Thank you.)

Please, I want your comments. Thank you!