Clarification Needed on Termination During Probation
The query lacks important information. Is the person on probation? When did he join the company? (He got the appointment letter on 09/06/15). He cannot be terminated by a future-dated letter (a clerical error, I suppose; anyway, it shows a casual and thoughtless approach by the Company HR). If the poster wants clear advice from members, kindly provide additional and relevant details.
Termination During Probation
Termination during probation also has to be done with care. You just cannot terminate a probationer with a stigma. (A due enquiry would be needed.) If termination during probation is based on unsatisfactory service, it can be done, but the employee can challenge it as arbitrary. A probationer is basically on a test, and if he fails the test, the employer can, in accordance with the letter of appointment, terminate him.