Outlook error : Error : 0x8004210B / 0x8004210A

This behavior occurs because some Internet service providers (ISP) do not permit message routing through another SMTP server while you are connected to their network. To resolve this behavior, replace the SMTP server for the other ISP or the other e-mail account with the SMTP server that is associated with the ISP that you use to connect to the Internet. To do so, follow these steps: Contact your ISP to obtain the outgoing SMTP e-mail server address.

1. Start Outlook 2002.
2. On the Tools menu, click E-mail Accounts.
3. Under E-mail, click View or change existing e-mail account, and then click Next.
4. Click the account that you want to change, and then click Change.
5. Under Server Information, type the name of your e-mail server that you determined in step 1 in the Outgoing mail server (SMTP) box, and then click Next.
6. Click Finish