Hi Kavita,
Boss' Day (also known as Bosses Day or National Boss Day) is a secular holiday celebrated on October 16 in the United States.
For a good mail you can use some quotes like the ones I have mentioned below and some pictures to support it accordingly.
By working faithfully eight hours a day you may eventually get to be boss and work twelve hours a day. ~Robert Frost
I've met a few people in my time who were enthusiastic about hard work. And it was just my luck that all of them happened to be men I was working for at the time. ~Bill Gold
Ability is what will get you to the top if the boss has no daughter.
Nothing so conclusively proves a man's ability to lead others as what he does from day to day to lead himself. | 
Boss day 
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