Suppose your are Tushar / Tuli . Shamim/Shirin is your best friend. The marriage ceremony of your elder sister is going to be held next week. Invite your friend by using email to attend the ceremony.
To: firstname.lastname@example.org / email@example.com
Subject : Invitation to my elder sister’s marriage ceremony.
At first, take my cordial love to you and your beautiful family. You will be happy to know that the marriage ceremony of my elder sister going to held next week. It will be celebrated at our residence at 7 p.m. All arrangements have already been made for the entertainment of a good number of guests. I shall be happy if you kindly join the function and attend the dinner. My parents also will be very glad to find you in your midst on this happy occasion. Don’t forget to come in the time. We will be very sorry if we miss you.
I am well. Please convey my best regards to your parents.
With love and good wishes to you.
Your loving friend