Exxon Mobil — My offer letter original (or) not

Hello sir/mam, I am GEETHA THANGAVEL, B.Com, BL, .I am an practicing advocate, in Tamil nadu, India. Email ID :- [protected]@yahoo.com Contuct no.[protected], [protected] I had received an OFFER LETTER from EXXON MOBIL UAE DATED 03.09.2015. by way of online interview for HR PERSONNAL JOB. I had received the above said offer letter way of my Email ID.Somebody tell me "This offer letter is fake, this is not true.you don"t follow any further proceeding." I attached here with photo copy of my OFFER LETTER - HR PERSONAL JOB. So I am very confused. Do you know about this please share me...say somthing... Thank you. Bests regards. GEETHA THANGAVEL, B.Com, BL, Advocate.