Recieved an email from biological dad ??

This is the responce from a letter I wrote to my possible bdad: I received your letter mailed December 10th. Sorry for not responding sooner. How to appropriately write back has been a challenge for me. If you feel comfortable, I think we have a lot to discuss. If you just want a yes or no, Im not sure I can offer you that. My hopes are after the Holidays we can write each other. Communication via email is good for me. My computer security is tight. If you write back and do not hear from me it is likely your response did not reach me. First thing that came to mind is , maybe this is not him....because after contacting my bmom I had learnded that he (my bdad ) had contacted her 10 years ago wanting to find me. He was going to move to part of the metro area so I could find him easier... I had learned he possibly changed his last name , so it is possible this is not him. I have learned through this website and several emotional feelings with emails from my biological mother, not to take this the way they sound it is possible that I am misreading the email ... pso I am taking a breath writting a brief reply and we will see what happens ..... What do you think??? Also, those of you that have been through this before do I update my bmom to all of this we've only been speaking for 2 months... or do I try my best to keep both of these experiences seprate ?? thanks so much you all have been so helpful in helping settle my emotions during this whole thing...