I am writing to confirm that this quotation is still valid. If you have any further questions, please do not hesitate to contact me.
Ps. Mr. XXX is not working with EMS anymore. I will contact you about these medical requirements.
The first part is OK, but adding a PS does not seem very business-like. I suggest you reword to integrate the PS with the main text.
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The first part is OK, but adding a PS does not seem very business-like. I suggest you reword to integrate the PS with the main text.