Can I say,
Dear Mr XXX,
This is Natalie, the new Senior Merchandiser from XX company. I will be taking the role of Mary and serve your account from now on. I wish to take a moment to introduce myself and to say hello.
Please feel free to contact me at (phone/ email) if I can be of any assistance.
I look forward to working with you soon.
Thank you for your attention.
This is better. Dear Mr ***, I am the new Senior Merchandiser for XX.. I will be taking over the role of Mary Smith and managing your account from now on.
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This is better.
Dear Mr ***,
I am the new Senior Merchandiser for XX.. I will be taking over the role of Mary Smith and managing your account from now on. I wish to take a moment to introduce myself and to say "Hello". (This last sentence implies that you are going to say something briefly about your background.)
Please feel free to contact me at (phone / email) if I