If I try sending an email to a user with an @163.com email address they don't receive the email. For example if I email XXXXX@XXXXXX.XXX. If they email me I don't receive their email. I don't get any notification that the email has bounced it just never arrives with the recipient. Same if they are sending to me - no notification it just never arrives in my inbox. Doesn't arrive in spam either. I have tried this with both my gmail and yahoo email addresses.
Here are a couple of examples.
Ok I have done that, but will take some time to get a response.