Cannot connect to subscriber in China

Typically this error indicates that you are trying to send your Adhost email through Adhost’s mail server when you have not authenticated your email account to send mail. Our mail server authenticates you through your pop account. So when you check your email, our mail server authenticates your pop user and password, captures that IP that you are checking your email from, and adds that IP to our relay list. This list is flushed every 70 minutes. This means, if you try to send email after the relay list has been flushed and before you’ve attempted to check your email, you will receive this error.


How to fix the problem:

Fix #1 - reauthenticate on our server.

Remove any email from your Outbox. If you need to keep the message, you can move it to your 'Drafts' folder.
Click "Send/Receive". This will reauthenticate you.
Try resending the email.
Fix #2 - configure your email client to check for email before sending.

In Outlook, go to "Tools" and select "Email Accounts". Make sure "View or change existing e-mail accounts" is checked. Click Next.
Select your account from the list and click "Change".
Select "More Settings".
Select "Outgoing Server".
Check "My outgoing server (SMTP) requires authentication".
Select "Log on to incoming mail server before sending mail".
Click "OK", then "Next", then "Finish".

This will fix your problem
Or
Call Yahoo! Customer Service

USA: 1-866-562-7219 --- 1-800-318-0631
UK 020 7131 1000
Canada: 1-877-722 3755
Direct Number: 1-408-349-1572

Regards
manish