How to write rejection letter for journal article (Example 1)

Dear colleague (name),

We received your manuscript with ID 06118: (title of the article),
and I regret to inform you that, based on plagiarism iThenticate program yours article showed 58% similarity with other papers. Due to a possible plagiarism we will not be possible to further consider your manuscript for publication in Journal for ReAttach Therapy and Developmental Diversities. 

This policy, though not always convenient to potential contributors, will help ensure that Journal for ReAttach Therapy and Developmental Diversities maintains a position of leadership in the field.
Again, thank you for your interest in the journal, and I regret that the outcome could not have been more favorable in this case.
JRTDD Editor-in-chief