I wanted to thank you for your input and share the solution that I
finally came to.
After adding the ip address of the RT server to the SMTP relay on our
Small Business Server I started to get an error
The message contains a content type that is not supported
domain.com #5.6.1 smtp;554 5.6.1 Body type not supported by Remote
Host
It turned out to be a problem with exchange listening for 8bitmime.
After I edited this setting on the SBS using adsiedit.msc and navigating
to
Configuration CN=config CN=services CN=Microsoft Exchange
CN=Domain CN=AdminGroups CN=firstadmingroup CN=Servers
CN=computername CN=Protocols CN=SMTP CN=1
And then changing the value of MSExchInboundCommand to reduce the
default number of 7697601 by 4194304. Here is an link that talks about
this field: http://support.microsoft.com/?kbid=257569. It now works
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