Question : NOQUEUE rejection, why?

I have a linux computer that hosts a virtual domain. I've been able to send email to users at that virtual domain w/o problem for a while, but it has stopped working. I'm sure I've done something, but I don't know what. I've restored the sendmail.cf to the working version and restarted sendmail, but no go. I get the message:

Oct 22 10:05:20 webhost1 sm-mta[22733]: NOQUEUE: tcpwrappers (rrcs-96-11-168-98.central.biz.rr.com, 96.11.168.98) rejection

Code Snippet:

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My sendmail.mc file: include(`../m4/cf.m4') VERSIONID(`$Id: webhost1.mc,v 1.0 2009/08/09 22:29:50 root Exp $')dnl OSTYPE(`linux')dnl define(`confPRIVACY_FLAGS', `authwarnings,novrfy,noexpn,restrictqrun')dnl define(`confTO_IDENT', `0')dnl define(`confBAD_RCPT_THROTTLE',`1')dnl define(`confCONNECTION_RATE_THROTTLE',`3')dnl define(`confDEAD_LETTER_DROP',`/dev/null')dnl define(`confDOUBLE_BOUNCE_ADDRESS',`nobody')dnl define(`confDF_BUFFER_SIZE',`16384')dnl define(`confXF_BUFFER_SIZE',`16384')dnl dnl FEATURE(`smrsh',`/usr/sbin/smrsh')dnl FEATURE(`use_cw_file')dnl FEATURE(`use_ct_file')dnl FEATURE(`mailertable',`hash -o /etc/mail/mailertable.db')dnl FEATURE(`virtusertable',`hash -o /etc/mail/virtusertable.db')dnl FEATURE(`access_db', `hash -T /etc/mail/access')dnl FEATURE(`lookupdotdomain')dnl FEATURE(`delay_checks',`friend',`n')dnl FEATURE(`local_procmail',`',`procmail -t -Y -a $h -d $u')dnl FEATURE(`always_add_domain')dnl FEATURE(`redirect')dnl EXPOSED_USER(`root')dnl LOCAL_DOMAIN(`localhost.localdomain')dnl MAILER(local)dnl MAILER(smtp)dnl MAILER(procmail)dnl

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Answer : NOQUEUE rejection, why?

The solution is to put

sendmail: ALL : allow

in /etc/hosts.allow