LinuxQuestions.org - RBL Check Infinite-Monkeys timed out and was killed

I am using redhat 9 and sendmail MTA...recently installed "openprotect-5[1].0.1.5.tar.gz" which includes Clam Antivirus and Spamassasin, which are scanning my outgoing messages and I have also get the information from my /var/log/maillog file. The problem when I see my /var/log/maillog file then I see at one place...

Apr 16 19:28:25 pc2 MailScanner[2818]: RBL Check Infinite-Monkeys timed out and was killed, consecutive failure 1 of 7

my question is what is that Infinite-Monkeys and do I need it and if not how can I disable it...

my /var/log/maillog file is as follows :

Apr 16 19:16:34 pc2 sendmail[2667]: starting daemon (8.12.8): SMTP
Apr 16 19:16:34 pc2 sm-msp-queue[2672]: starting daemon (8.12.8): queueing@00:05:00
Apr 16 19:16:34 pc2 sendmail[2677]: starting daemon (8.12.8): queueing@00:01:00
Apr 16 19:16:36 pc2 spamd[2481]: server started on port 783/tcp (running version 2.60)
Apr 16 19:16:38 pc2 MailScanner[2695]: MailScanner E-Mail Virus Scanner version 4.24-5 starting...
Apr 16 19:16:49 pc2 MailScanner[2764]: MailScanner E-Mail Virus Scanner version 4.24-5 starting...
Apr 16 19:17:01 pc2 MailScanner[2811]: MailScanner E-Mail Virus Scanner version 4.24-5 starting...
Apr 16 19:17:13 pc2 MailScanner[2818]: MailScanner E-Mail Virus Scanner version 4.24-5 starting...
Apr 16 19:17:20 pc2 MailScanner[2874]: MailScanner E-Mail Virus Scanner version 4.24-5 starting...
Apr 16 19:17:36 pc2 MailScanner[2764]: Using locktype = flock
Apr 16 19:17:43 pc2 MailScanner[2874]: Using locktype = flock
Apr 16 19:18:00 pc2 MailScanner[2811]: Using locktype = flock
Apr 16 19:18:04 pc2 MailScanner[2818]: Using locktype = flock
Apr 16 19:18:08 pc2 MailScanner[2695]: Using locktype = flock
Apr 16 19:27:32 pc2 sendmail[3319]: i3GDQe1B003319: from=<root@pc2.dns2.com>, size=262, class=0, nrcpts=1, msgid=<Pine.LNX.4.44.0404161926230.3316-100000@pc2.dns2.com>, proto=ESMTP, relay=root@localhost
Apr 16 19:27:55 pc2 sendmail[3333]: i3GDRXOQ003333: from=<root@pc2.dns2.com>, size=436, class=0, nrcpts=1, msgid=<Pine.LNX.4.44.0404161926230.3316-100000@pc2.dns2.com>, proto=ESMTP, daemon=MTA, relay=localhost.localdomain [127.0.0.1]
Apr 16 19:27:55 pc2 sendmail[3333]: i3GDRXOQ003333: to=<ekramul@bol-online.com>, delay=00:00:00, mailer=esmtp, pri=30424, stat=queued
Apr 16 19:27:55 pc2 sendmail[3332]: i3GDQe1B003319: to=<ekramul@bol-online.com>, ctladdr=<root@pc2.dns2.com> (0/0), delay=00:00:23, xdelay=00:00:23, mailer=relay, pri=30250, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (i3GDRXOQ003333 Message accepted for delivery)
Apr 16 19:28:13 pc2 MailScanner[2818]: New Batch: Scanning 1 messages, 905 bytes
Apr 16 19:28:13 pc2 MailScanner[2818]: MCP Checks: Starting
Apr 16 19:28:25 pc2 MailScanner[2818]: RBL Check Infinite-Monkeys timed out and was killed, consecutive failure 1 of 7
Apr 16 19:28:48 pc2 MailScanner[2818]: Virus and Content Scanning: Starting
Apr 16 19:28:52 pc2 MailScanner[2818]: Uninfected: Delivered 1 messages
Apr 16 19:29:12 pc2 sendmail[3350]: i3GDRXOQ003333: to=<ekramul@bol-online.com>, ctladdr=<root@pc2.dns2.com> (0/0), delay=00:01:17, xdelay=00:00:08, mailer=esmtp, pri=120424, relay=mailin-01.bol-online.com. [202.84.36.9], dsn=2.0.0, stat=Sent (Ok: queued as 596968B4C9)
Apr 16 19:41:15 pc2 sendmail[3494]: i3GDfF2o003494: from=<root@pc2.dns2.com>, size=331, class=0, nrcpts=3, msgid=<Pine.LNX.4.44.0404161940440.3493-100000@pc2.dns2.com>, proto=ESMTP, relay=root@localhost
Apr 16 19:41:56 pc2 sendmail[3498]: i3GDfFOQ003498: from=<root@pc2.dns2.com>, size=475, class=0, nrcpts=3, msgid=<Pine.LNX.4.44.0404161940440.3493-100000@pc2.dns2.com>, proto=ESMTP, daemon=MTA, relay=localhost.localdomain [127.0.0.1]
Apr 16 19:41:56 pc2 sendmail[3497]: i3GDfF2o003494: to=<root@pc4.dns4.com>,<root@pc3.dns3.com>,<root@pc2.dns2.com>, ctladdr=<root@pc2.dns2.com> (0/0), delay=00:00:41, xdelay=00:00:41, mailer=relay, pri=90309, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (i3GDfFOQ003498 Message accepted for delivery)
Apr 16 19:41:58 pc2 MailScanner[2874]: New Batch: Scanning 1 messages, 1021 bytes
Apr 16 19:41:58 pc2 MailScanner[2874]: MCP Checks: Starting
Apr 16 19:42:12 pc2 MailScanner[2874]: Virus and Content Scanning: Starting
Apr 16 19:42:14 pc2 MailScanner[2874]: Uninfected: Delivered 1 messages
Apr 16 19:42:15 pc2 sendmail[3512]: i3GDfFOQ003498: to=<root@pc2.dns2.com>, ctladdr=<root@pc2.dns2.com> (0/0), delay=00:00:39, xdelay=00:00:00, mailer=local, pri=180453, dsn=2.0.0, stat=Sent