How to Write a Thank You Letter After an Interview
You should write a thank you letter as soon as possible (within 24 hours is recommended) after the job interview, at a minimum this should be done through email but is recommended that you do this through a hard-copy of a letter printed from your computer and mailed through the postal service. Hand written notes on thank you cards are also acceptable and good for short thank you notes.
A hard-copy thank you letter should be written in the business letter format, while an email should be sent in the same format but without the heading (your return address, their address, and the date).
Thank you letter writing
The first paragraph should consist of thanking the interviewer for the interviewing you (remind him/her about the position you interviewed for and the date of your interview). You can also include information about your impressions about the company.