simple & short Resignation Letter (for personal problem)

To,

Managing Director

Company/Office Name

Subject: - Resignation Letter.

Dear Sir, 

I’m resigning from my post because of my personal problem.

I apologize for that & I am grateful to you that i gather much knowledge from here & enjoyed working with "Company/Office Name" very much. 

My last day will October 15, 2011.

Sincerely,

 

sign here ...................

Your Name