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Are these natural in email?

We remain at your disposal should you need any more assitance.
In response to your email, I have the pleasure to inform you that we have shipped your products.

Good night
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They are too formal.
Comments  
Teachers: We supply a list of EFL job vacancies
I would like formal writing. Is it correct english,

*remain at your disposal
Too formal. It sounds like a 19th-century letter.