1. Inform him that you have not received the said email from him and even if it was sent by him it had gone to junk box if he has sent it through mass mailing software,
2. You can offer your mail box to be examined by professionals,
3. You send him a legal letter asking for the possession immediately without changing anything for the aforesaid reason,
4. Ig he fails or refuses, file a complaint case before the local District Consumer Dispute Redressal forum alleging deficiency in service and claiming immediate possession of the plot, danage and cost.