1.Thank you very much for your email/information.
2.I agree to exchange (the postcards?) with you.
3.However,I am out of town now as I am traveling to several places.
4.When I return to my home on Oct.8,I will immediately send it to you by post.
5.Please bear with me.Below is my address in China:
注:bear with me = 请多多包涵,等待.