When exporting a document containing merge fields to DOCX, the items source you've set is exported with it. In this way when the document is imported back, the respective fields on the document will be resolved properly.
However, performing the Mail Merge operation is different from this. When merging the document the resulting DOCX no longer contains merge fields - they are replaced with the respective values.
I am attaching for your reference two files - one of them was exported from the Mail Merge demo
for RadRichTextBox, and the other is the result of the Mail Merge operation in the same demo.
I hope this helps!
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