[Exim] FW: need help .

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I need help
Recently I installed exim-3.22-2 On redhat 7.0. it seems every thing is
fine. Mail delivery in local domain is fine .
but when I want to send mail to out side I get domain unrouteable mail
domain "yahoo.com"
then I add this value to exim.conf .
lookuphost:
driver = lookuphost
transport = remote_smtp

literal:
driver = ipliteral
transport = remote_smtp

I get error in exim.conf

remote_smtp transport, referred to in line 303, was not found

however I have this setting on exim on debian ,
and really I don’t know what is the problem .

please help me .

Best regards
Mohammad
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