Making format changes to APP+ Confirmaiton email message?

Hi,

I want some text in the email sent to clients to appear as Italics i tried adding <i> and </i> for the changes to take effect however when tested in email it doesnt show the italics and instead just shows the <i> tag at the start and </i> at the end? is there a way to achive this text formatting?

- Settings - http://monosnap.com/image/ZN9IS3rskqkIfesCWZHVQcIjWRazvv
- Result - http://monosnap.com/image/Hx6EQCVOXFDPBAczjW81nrJCOJNDLc

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Thanks
Tom