Please help problems with the mail script on Redhat 7.2

I have installed RT on Redhat 7.2 and this keeps popping up in the
maillog and the issue/ticket never gets put into the database. Does
anyone know how to fix this. Please help

Oct 4 15:24:18 help sendmail[5975]: g94LOHh05974:
to="|/usr/local/rt2/bin/rt-mailgate --queue general --action
correspond", (8/0),
delay=00:00:00, xdelay=00:00:00, mailer=prog, pri=30026, dsn=5.0.0,
stat=Service unavailable


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