Expression: "With reference to the appended email please be..."

[Tom]

Hi

Does the following sound formal and natural? Any mistakes--especially in the red part?

[Mister Micawber]

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With reference to the email appended below, please be informed that the material for the Induction Program cannot be sent by email as its size exceeds the limit.
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_________________
Native English teacher at Mister Micawber's