thank you very much for your question. My name is***** and I will try to help you as quick possible.
Usually, if that is the case, you can´t do much about it, since 163.com might simply reject your email addresses. Would you allow me to send a test-email to that email address, so that I can see if it bounces for me too and being able to analyze the reason of the bounce?
Thanks for your patience and best regards,
I see that you have read my answer already. Do you still need my help? If so, please just reply again and I will help you further on to fix your problem. That involves no additional costs for you, you can reply as often as you want until I was able to solve your problem to your satisfaction. If not, please be so kind and submit a positive rating (select 3 to 5 stars at the right top of the screen and click "submit"), so that your question can be closed.
Thank you very much and best regards,