How about this:

Dear [Manager's Name],

I am writing to announce my resignation from my position at [Company Name], effective immediately. Please consider this letter as my formal notice.

I would like to express my gratitude for the opportunities I have had during my tenure at [Company Name]. However, after careful consideration, I have decided that it is in my best interest to resign from my current position. I will ensure a smooth handover of my responsibilities to my team and complete any pending tasks to the best of my ability before my departure.

I would like to take this opportunity to extend my appreciation to you and the team for the support you have given me at the company, I have learned a great deal.

I would like to request that my remaining vacation days be paid out in accordance with company policy. Additionally, I would appreciate any guidance on the exit process and returning company property.

Thank you for your understanding and cooperation during this transition period. I wish you and the team all the best in your future endeavors.

Sincerely,
[Your Name]
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