Dear Ronin,
Only an Email as to extension of the contract will not be acceptable as you may have not signed it. Also, if the contract ends on 31st March, then the condition of 2 months of notice period will not arise, as they are ending the contract and not renewing it. Also, if you have the copy of the email, that has been specifically written to you, then it can be taken as a proof, otherwise in general a mail, is of no use.
Also, we are not able to read the clause, which says what happens, if they terminate the contract on the mentioned date.
So, i think, you will not be eligible for the 2 months notice period.