Email Problem / Exchange 2010

i have problem that the emails delayed and take more than 1 hour to be received from out side
any suggestions

here is the output for http://www.mxtoolbox.com/
220 remote.elixir-united.com Microsoft ESMTP MAIL Service ready at Mon, 19 Dec 2011 16:03:03 +0300

 OK - ((MY IP)) resolves to dynamic-dsl.nesma.net.sa
 Warning - Reverse DNS does not match SMTP Banner
 0 seconds - Good on Connection time
Not an open relay.
 6.443 seconds - Warning on Transaction time

Session Transcript:
HELO please-read-policy.mxtoolbox.com
250 remote.elixir-united.com Hello [192.168.4.99] [234 ms]
MAIL FROM: <supertool@mxtoolbox.com>
250 2.1.0 Sender OK [250 ms]
RCPT TO: <test@example.com>
550 5.7.1 Unable to relay [5226 ms]
QUIT
221 2.0.0 Service closing transmission channel [250 ms]
SawyerAsked:
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kpa2011Commented:
Check internet header of a delayed mail to check where mail is getting delayed. If it's external to your org you can not do much on this other than contacting them. But if it is delayed at your end check the point the point of delay.

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