Letter from customers nine years ago

Dear Sir/Madam,
how are you? I have emailed Grace, but I am not sure if she is
available. Bellow the description of some issue of concerning the N2

plant we have acquired from you in 2010.

……

Michael

Dear Michael,
Good day!  This is Grace.Hope you are doing fine!
Your this email we got it,  but sorry I didn't got the email you 
mentioned  mailed to Grace.
The nitrogen generator in 2010 has been running steadily for 9 years, which makes us feel gratified.

Thanks&Greetings

Grace(Ms.)