Select Mail > Templates
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You can use the filter at the Active column "No"
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Click on the pencil to enter the template
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Click on "Preview" in order to visualise the mail template
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Remember not to alter the paragraph with the black background, given that it has specific codes and my modifying them it may generate an error at the template.
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If you would like to reactivate this template, you can find the steps to do so at this article: http://help.rentlysoft.com/en/articles/5273237-how-to-activate-mail-templates