Dear Sir or Madam,
I hope this letter finds you well. My name isXXXXX and I am the new sales director for your area. I will be replacing Mr. XXXXX XXXXX, who has serviced your account for the past xx years. If you have any questions or concerns, you can reach me at(NNN) NNN-NNNN and I would be happy to help you.
Happy Holidays and I look forward to speaking to you.
XXXXX XXXXX, Sales Director
You can change it to suit your needs, and there should not be a line between your name and the co name.
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